Re: Stus-List Klacko
It sure looks like a spreader to me. Jake Jake Brodersen Midnight Mistress CC 35 Mk-III Hampton VA From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Greg Arnold via CnC-List Sent: Friday, December 05, 2014 2:18 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Klacko Great photo. Is the reaching strut a spreader? On 12/5/2014 11:03 AM, Michael Brown via CnC-List wrote: That might have been the mast for Fantome, an R boat at the National Yacht Club. http://www.fantomer18.com/ The mast was replaced in 2013 when the previous wood mast failed. Does look good. Michael Brown Windburn CC 30-1 Date: Fri, 5 Dec 2014 11:16:16 -0500 From: Ken Rodmell moo...@sympatico.ca To: cnc-list@cnc-list.com Subject: Stus-List Klacko Message-ID: blu436-smtp174fe6d34dad4145f1ba9b2b9...@phx.gbl Content-Type: text/plain; charset=iso-8859-1 Klacko has done repairs for me on my spreaders and several years ago built me a new holding tank. I?ve found them to be great to deal with?excellent work, reasonable, and a good attitude. BTW, the last time I was there, I was treated to a beautiful sight, they had just painted ( deep yellow) a new mast they?d made for an 8 metre and it was drying in their shed. Ken Rodmell Lotus CC 35 Mk II Toronto ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List Masthead sheaves replacement
David, I replaced several of my sheaves many years ago. The groove for the wire is not that deep. All rope halyards run over them pretty easily without any additional drag. I replaced mine because the plain bearing material had worn away. The original stainless steel shafts were easy to clean up with emery paper. Jake Jake Brodersen “Midnight Mistress” CC 35 Mk-III Hampton VA From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of davidrisch75 via CnC-List Sent: Friday, December 05, 2014 2:35 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Masthead sheaves replacement Ok. So I may have had a brain cramp around this issue. I never thought I needed to replace the sheeves after going all rope halyard as I thought the line would ride above the sheeves wire recess. As my main is a pia to hoist maybe it is digging into the recess when hoisting the main and causing excess drag? David F. Risch. Please excuse brevity and possible typos...sent from my mobile device. ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List List LF38 engine access - how bad is it really?
A previous owner of my LF-38 made up some pvc pipe extensions (one for oil, one for coolant) for use when filling. They mean that you can fill from the quarter berth, rather than directly over the engine. Henry Reeve, LF-38 Lone Star From: Robert Boyer via CnC-List cnc-list@cnc-list.com To: cnc-list@cnc-list.com cnc-list@cnc-list.com Sent: Wednesday, December 3, 2014 7:06 AM Subject: Stus-List List LF38 engine access - how bad is it really? In my opinion its not all that bad. There is a lot of access through the starboard cockpit locker for changing the solenoid/starter, oil filter, air filter, and v-belts. The panel between the cockpit locker and the engine is removable. Getting to the water pump to change the impeller was difficult so I installed much longer inlet and outlet hoses so that I can pull the water pump out into the port quarter berth without even disconnecting the hoses--this was a big improvement for changing the rubber impellers. Putting oil in the crankcase is a challenge since the headroom between the top of the engine and the lower surface of the cockpit deck is very limited but adding oil can be done--its usually only done once per year for most of us. I don't have maintenance experience on many boats but my Landfall 38 has much better engine access than my Sabre 28 had for sure. Bob BoyerS/V Rainy Days / Annapolis MD1983 CC Landfall 38 - Hull #230email: dainyr...@icloud.com blog: dainyrays.blogspot.com There is nothing--absolutely nothing--half so much worth doing as simply messing about in boats. --Kenneth Grahame ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List Masthead sheaves replacement
When I switched from wire/rope halyards to all rope I removed the sheaves and machined them from a V groove to a U groove. At the same time I replaced the bearings with new oilite bronze. After two years I pulled the sheaves again and the bearings were noticeably worn with cracks at the edges. Replaced them again. Two years later it was the same story so I replaced them with Isomat Acetyl sheaves that run on a matching Acetyl bearing. The bearing was drilled out to be a press fit over the SS shaft. The last part was adding custom cut sheets of delrin on both sides of the sheaves and in between to act as thrust bearings. I suspect that a process was occurring that added significant friction and wear with the previous aluminum sheaves and oilite bearings. The bearings were crushing down enough even over one racing season to allow some slop, which translates into the sheave twisting in the mast head. The side of the sheave would then rub on some part and cause friction as the halyard tensioned. The original setup used two sheets of aluminum to separate the sheaves, both were heavily scored. At some point a previous owner swapped the plates around to get a clean surface again. There is not that many rotations of the sheave under load so judging by the depth of the gouges on the material I would say the twisting force would have to be pretty high. The bearing diameter on the acetyl sheaves is larger, and the plastic to plastic slipperiness presents lower friction than the oilite on SS did. I have not pulled the mast apart to do a thorough examination but a check when I unstepped the mast for the season looked like there was no wear. I did head sail changes during the Lake Ontario 300 in 20 to 30+ kts true. Usually an outside hoist would require hard winching most of the way up, with the new setup it was much easier. The sheaves on a 30-1 are 3.5 OD and 0.5 width, 7/16 ID on the bearing. A reasonable fit was the Isomat 85mm x 15mm ( 3 3/8 x 5/8 ) using a 22mm ( 7/8 ) ID and a matching acetyl bearing. http://www.rig-rite.com/Spars/Isomat_Spars/isomat_sheaves.html The acetyl is rated for handling wire halyards. Michael Brown Windburn CC 30-1 Date: Sat, 6 Dec 2014 09:12:25 -0500 From: Jake Brodersen captain_j...@cox.net To: 'davidrisch75' davidrisc...@msn.com, cnc-list@cnc-list.com Subject: Re: Stus-List Masthead sheaves replacement Message-ID: 091a01d0115e$a9637550$fc2a5ff0$@cox.net Content-Type: text/plain; charset=utf-8 David, I replaced several of my sheaves many years ago. The groove for the wire is not that deep. All rope halyards run over them pretty easily without any additional drag. I replaced mine because the plain bearing material had worn away. The original stainless steel shafts were easy to clean up with emery paper. Jake Jake Brodersen ?Midnight Mistress? CC 35 Mk-III Hampton VA ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Stus-List Yacht Charter for the PNW Rendezvous?
I am beginning to make plan to attend the PNW Rendezvous on Thetis Island, BC in early August, 2015. And I think a charter and a bit of time to explore the Gulf Islands with my Admiral would be a really nice trip. I have a friend who went sailing there last summer with a friend of hers, and there was rumor that they could put me in contact with the owner of a classic CC that was available for charter. That didn't work out. And the friend of my friend has sold her own boat and won't take delivery of the new Hunter she has ordered until about the end of July. So it looks like those charter options are closed. I've been looking on the web for a charter company near Vancouver with a CC in their fleet. And I found that Island Cruising has CC 115 listed among their fleet; but the boat isn't listed in their 2015 rate information. I've sent them an inquiry, but haven't gotten any information back yet. So, as an alternative, I thought I would fall back on the knowledge of the listers in the area. Can anyone point me toward a CC (or at least a CC designed boat) that would be available for charter in the Vancouver/Gulf Islands area? Thanks for the help. Rick Brass Imzadi CC 38 mk 2 la Belle Aurore CC 25 mk1 Washington, NC ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List Navigation
Hope you are having a great, and warm, weekend, Dennis. It is rainy, gray, and the high was about 60 in NC today. Not a nice day for boating. We have all experienced the sort of GPS errors you mentioned at one time or another. And because we all know that our GPS receiver can calculate out position to an accuracy of 30 feet or so, we tend to think that the charts are wrong. But that might not be the whole truth. I’d bet NOAA had pretty good GPS location numbers on the buoys you “hit”, and is not far off on the position of the seawall. The 10 to 30 foot accuracy our GPS reports is based on things like the number and position of the satellites from which it is getting signals, allowing for things like the accuracy of its internal clock, inaccuracy in the chart datum, and the radio waves that carry the time signals from the satellites getting “bent” by the Earth’s magnetic field. But there is another variable that the GPS can’t allow for. I remember reading, a few years ago, about the GPS system in one of the science magazines aimed at geeks like me (Probably Scientific American or Air and Space, but I can’t recall for sure). Seems the GPS system is a good example of Einstein’s Theory of Relativity. Part of the theory says that when you go faster, time slows down relative to time measured in a location that is moving more slowly. The GPS satellites are traveling at something like 18000MPH faster than we are on the Earth’s surface. So the atomic clocks on the satellites “tick” just a wee bit more slowly than the clock on earth. There is a government facility outside of Omaha where military personnel are tasked with adjusting the clocks on the satellites, by a few microseconds or nanoseconds, several times per day to maintain the accuracy of the time signals relative to the earthbound time. As I recall, if the clocks were not adjusted for 24 hours, the calculated position of a spot on Earth would be off by something like 5 miles. That’s probably more than you wanted to know. But you can probably chalk up all those buoys the chartplotter boat ran into to Albert. Oh, and another bit of Einstein trivia: He issued the original patents for the recipe for Tolberone Chocolate, and the shape of the candy. Which is not boating related, unless your Admiral likes really good chocolate. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dennis C. via CnC-List Sent: Monday, December 01, 2014 8:48 AM To: Della Barba, Joe; cnc-list@cnc-list.com Subject: Re: Stus-List Navigation I was motoring up a harbor looking at a nice Raymarine system showing the boat going through a sea wall 200 feet west of our actual position. Yesterday while motoring in the ICW channel in Santa Rosa Sound near Navarre, FL, the chartplotter boat took out several of the buoys on the right side of the channel. Dennis C. Touché 35-1 #83 Mandeville, LA Currently on the hook at 30 23.054N 86 51.884W Sent from my iPhone ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List Navigation
Civilian GPS equipment is intentionally less accurate than military equipment. Your government doesn't want you to know exactly where you are! Joel On Saturday, December 6, 2014, Rick Brass via CnC-List cnc-list@cnc-list.com wrote: Hope you are having a great, and warm, weekend, Dennis. It is rainy, gray, and the high was about 60 in NC today. Not a nice day for boating. We have all experienced the sort of GPS errors you mentioned at one time or another. And because we all know that our GPS receiver can calculate out position to an accuracy of 30 feet or so, we tend to think that the charts are wrong. But that might not be the whole truth. I’d bet NOAA had pretty good GPS location numbers on the buoys you “hit”, and is not far off on the position of the seawall. The 10 to 30 foot accuracy our GPS reports is based on things like the number and position of the satellites from which it is getting signals, allowing for things like the accuracy of its internal clock, inaccuracy in the chart datum, and the radio waves that carry the time signals from the satellites getting “bent” by the Earth’s magnetic field. But there is another variable that the GPS can’t allow for. I remember reading, a few years ago, about the GPS system in one of the science magazines aimed at geeks like me (Probably Scientific American or Air and Space, but I can’t recall for sure). Seems the GPS system is a good example of Einstein’s Theory of Relativity. Part of the theory says that when you go faster, time slows down relative to time measured in a location that is moving more slowly. The GPS satellites are traveling at something like 18000MPH faster than we are on the Earth’s surface. So the atomic clocks on the satellites “tick” just a wee bit more slowly than the clock on earth. There is a government facility outside of Omaha where military personnel are tasked with adjusting the clocks on the satellites, by a few microseconds or nanoseconds, several times per day to maintain the accuracy of the time signals relative to the earthbound time. As I recall, if the clocks were not adjusted for 24 hours, the calculated position of a spot on Earth would be off by something like 5 miles. That’s probably more than you wanted to know. But you can probably chalk up all those buoys the chartplotter boat ran into to Albert. Oh, and another bit of Einstein trivia: He issued the original patents for the recipe for Tolberone Chocolate, and the shape of the candy. Which is not boating related, unless your Admiral likes really good chocolate. Rick Brass Washington, NC *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com javascript:_e(%7B%7D,'cvml','cnc-list-boun...@cnc-list.com');] *On Behalf Of *Dennis C. via CnC-List *Sent:* Monday, December 01, 2014 8:48 AM *To:* Della Barba, Joe; cnc-list@cnc-list.com javascript:_e(%7B%7D,'cvml','cnc-list@cnc-list.com'); *Subject:* Re: Stus-List Navigation I was motoring up a harbor looking at a nice Raymarine system showing the boat going through a sea wall 200 feet west of our actual position. Yesterday while motoring in the ICW channel in Santa Rosa Sound near Navarre, FL, the chartplotter boat took out several of the buoys on the right side of the channel. Dennis C. Touché 35-1 #83 Mandeville, LA Currently on the hook at 30 23.054N 86 51.884W Sent from my iPhone -- Joel 301 541 8551 ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List Navigation
Joel, I've heard this argument years ago, that the gov't intentionally altered the GPS signal. I really think the system is not being jambed, but the number of satelites connected could be limited. I think it's more to control bandwidth than to intentially confuse non-military users. Don't think they want us to run off course and have to dispatch more resources like coast guard helicopters to rescue boater Chuck Resolute 1990 CC 34R Broad Creek, Magothy River, Md - Original Message - From: CNC boat owners, cnc-list cnc-list@cnc-list.com To: Rick Brass rickbr...@earthlink.net, CNC boat owners, cnc-list cnc-list@cnc-list.com Sent: Saturday, December 6, 2014 10:18:58 PM Subject: Re: Stus-List Navigation Civilian GPS equipment is intentionally less accurate than military equipment. Your government doesn't want you to know exactly where you are! Joel On Saturday, December 6, 2014, Rick Brass via CnC-List cnc-list@cnc-list.com wrote: Hope you are having a great, and warm, weekend, Dennis. It is rainy, gray, and the high was about 60 in NC today. Not a nice day for boating. We have all experienced the sort of GPS errors you mentioned at one time or another. And because we all know that our GPS receiver can calculate out position to an accuracy of 30 feet or so, we tend to think that the charts are wrong. But that might not be the whole truth. I’d bet NOAA had pretty good GPS location numbers on the buoys you “hit”, and is not far off on the position of the seawall. The 10 to 30 foot accuracy our GPS reports is based on things like the number and position of the satellites from which it is getting signals, allowing for things like the accuracy of its internal clock, inaccuracy in the chart datum, and the radio waves that carry the time signals from the satellites getting “bent” by the Earth’s magnetic field. But there is another variable that the GPS can’t allow for. I remember reading, a few years ago, about the GPS system in one of the science magazines aimed at geeks like me (Probably Scientific American or Air and Space, but I can’t recall for sure). Seems the GPS system is a good example of Einstein’s Theory of Relativity. Part of the theory says that when you go faster, time slows down relative to time measured in a location that is moving more slowly. The GPS satellites are traveling at something like 18000MPH faster than we are on the Earth’s surface. So the atomic clocks on the satellites “tick” just a wee bit more slowly than the clock on earth. There is a government facility outside of Omaha where military personnel are tasked with adjusting the clocks on the satellites, by a few microseconds or nanoseconds, several times per day to maintain the accuracy of the time signals relative to the earthbound time. As I recall, if the clocks were not adjusted for 24 hours, the calculated position of a spot on Earth would be off by something like 5 miles. That’s probably more than you wanted to know. But you can probably chalk up all those buoys the chartplotter boat ran into to Albert. Oh, and another bit of Einstein trivia: He issued the original patents for the recipe for Tolberone Chocolate, and the shape of the candy. Which is not boating related, unless your Admiral likes really good chocolate. Rick Brass Washington, NC From: CnC-List [mailto: cnc-list-boun...@cnc-list.com ] On Behalf Of Dennis C. via CnC-List Sent: Monday, December 01, 2014 8:48 AM To: Della Barba, Joe; cnc-list@cnc-list.com Subject: Re: Stus-List Navigation I was motoring up a harbor looking at a nice Raymarine system showing the boat going through a sea wall 200 feet west of our actual position. Yesterday while motoring in the ICW channel in Santa Rosa Sound near Navarre, FL, the chartplotter boat took out several of the buoys on the right side of the channel. Dennis C. Touché 35-1 #83 Mandeville, LA Currently on the hook at 30 23.054N 86 51.884W Sent from my iPhone blockquote /blockquote -- Joel 301 541 8551 ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List Navigation
if you are using a WAAS enabled GPS - the accuracy is as good as military - it compensates for the offset. Sent from my iPhone On Dec 6, 2014, at 19:34, Chuck S via CnC-List cnc-list@cnc-list.com wrote: Joel, I've heard this argument years ago, that the gov't intentionally altered the GPS signal. I really think the system is not being jambed, but the number of satelites connected could be limited. I think it's more to control bandwidth than to intentially confuse non-military users. Don't think they want us to run off course and have to dispatch more resources like coast guard helicopters to rescue boater Chuck Resolute 1990 CC 34R Broad Creek, Magothy River, Md From: CNC boat owners, cnc-list cnc-list@cnc-list.com To: Rick Brass rickbr...@earthlink.net, CNC boat owners, cnc-list cnc-list@cnc-list.com Sent: Saturday, December 6, 2014 10:18:58 PM Subject: Re: Stus-List Navigation Civilian GPS equipment is intentionally less accurate than military equipment. Your government doesn't want you to know exactly where you are! Joel On Saturday, December 6, 2014, Rick Brass via CnC-List cnc-list@cnc-list.com wrote: Hope you are having a great, and warm, weekend, Dennis. It is rainy, gray, and the high was about 60 in NC today. Not a nice day for boating. We have all experienced the sort of GPS errors you mentioned at one time or another. And because we all know that our GPS receiver can calculate out position to an accuracy of 30 feet or so, we tend to think that the charts are wrong. But that might not be the whole truth. I’d bet NOAA had pretty good GPS location numbers on the buoys you “hit”, and is not far off on the position of the seawall. The 10 to 30 foot accuracy our GPS reports is based on things like the number and position of the satellites from which it is getting signals, allowing for things like the accuracy of its internal clock, inaccuracy in the chart datum, and the radio waves that carry the time signals from the satellites getting “bent” by the Earth’s magnetic field. But there is another variable that the GPS can’t allow for. I remember reading, a few years ago, about the GPS system in one of the science magazines aimed at geeks like me (Probably Scientific American or Air and Space, but I can’t recall for sure). Seems the GPS system is a good example of Einstein’s Theory of Relativity. Part of the theory says that when you go faster, time slows down relative to time measured in a location that is moving more slowly. The GPS satellites are traveling at something like 18000MPH faster than we are on the Earth’s surface. So the atomic clocks on the satellites “tick” just a wee bit more slowly than the clock on earth. There is a government facility outside of Omaha where military personnel are tasked with adjusting the clocks on the satellites, by a few microseconds or nanoseconds, several times per day to maintain the accuracy of the time signals relative to the earthbound time. As I recall, if the clocks were not adjusted for 24 hours, the calculated position of a spot on Earth would be off by something like 5 miles. That’s probably more than you wanted to know. But you can probably chalk up all those buoys the chartplotter boat ran into to Albert. Oh, and another bit of Einstein trivia: He issued the original patents for the recipe for Tolberone Chocolate, and the shape of the candy. Which is not boating related, unless your Admiral likes really good chocolate. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dennis C. via CnC-List Sent: Monday, December 01, 2014 8:48 AM To: Della Barba, Joe; cnc-list@cnc-list.com Subject: Re: Stus-List Navigation I was motoring up a harbor looking at a nice Raymarine system showing the boat going through a sea wall 200 feet west of our actual position. Yesterday while motoring in the ICW channel in Santa Rosa Sound near Navarre, FL, the chartplotter boat took out several of the buoys on the right side of the channel. Dennis C. Touché 35-1 #83 Mandeville, LA Currently on the hook at 30 23.054N 86 51.884W Sent from my iPhone -- Joel 301 541 8551 ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is
Re: Stus-List Navigation
Actually, a front coming through tonight is dropping the the temp dramatically. :) As for the navigation thread, we were motoring a narrow section of the ICW before sunup this morning. Although Touché was in the middle of the ditch, the GPS showed us about 150 yards north in the pine trees. Further in the ICW, the graphical depiction of the channel did not match the markers or our location. That is, the different colored channel was outside the markers. The markers appeared accurate. So, much of the inaccuracies we see are in the GIS data in the maps. I'd bet that if I'd plotted the location from the GPS position data on a paper chart, I'd have been in the channel and not in the woods. Gas wells in Mobile Bay were close to the charted positions. My auto steerer is always pretty much dead on because the waypoints I use are all observed. That is, they were set from actual boat position using the mark function of the GPS. Some were set several years ago. The fact that the GPS via the auto steerer brings me back to them accurately after several years is verification of the accuracy of the GPS system. Dennis C. Touché 35-1 #83 Mandeville, LA Sent from my iPhone On Dec 6, 2014, at 8:58 PM, Rick Brass rickbr...@earthlink.net wrote: Hope you are having a great, and warm, weekend, Dennis. It is rainy, gray, and the high was about 60 in NC today. Not a nice day for boating. We have all experienced the sort of GPS errors you mentioned at one time or another. And because we all know that our GPS receiver can calculate out position to an accuracy of 30 feet or so, we tend to think that the charts are wrong. But that might not be the whole truth. I’d bet NOAA had pretty good GPS location numbers on the buoys you “hit”, and is not far off on the position of the seawall. The 10 to 30 foot accuracy our GPS reports is based on things like the number and position of the satellites from which it is getting signals, allowing for things like the accuracy of its internal clock, inaccuracy in the chart datum, and the radio waves that carry the time signals from the satellites getting “bent” by the Earth’s magnetic field. But there is another variable that the GPS can’t allow for. I remember reading, a few years ago, about the GPS system in one of the science magazines aimed at geeks like me (Probably Scientific American or Air and Space, but I can’t recall for sure). Seems the GPS system is a good example of Einstein’s Theory of Relativity. Part of the theory says that when you go faster, time slows down relative to time measured in a location that is moving more slowly. The GPS satellites are traveling at something like 18000MPH faster than we are on the Earth’s surface. So the atomic clocks on the satellites “tick” just a wee bit more slowly than the clock on earth. There is a government facility outside of Omaha where military personnel are tasked with adjusting the clocks on the satellites, by a few microseconds or nanoseconds, several times per day to maintain the accuracy of the time signals relative to the earthbound time. As I recall, if the clocks were not adjusted for 24 hours, the calculated position of a spot on Earth would be off by something like 5 miles. That’s probably more than you wanted to know. But you can probably chalk up all those buoys the chartplotter boat ran into to Albert. Oh, and another bit of Einstein trivia: He issued the original patents for the recipe for Tolberone Chocolate, and the shape of the candy. Which is not boating related, unless your Admiral likes really good chocolate. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dennis C. via CnC-List Sent: Monday, December 01, 2014 8:48 AM To: Della Barba, Joe; cnc-list@cnc-list.com Subject: Re: Stus-List Navigation I was motoring up a harbor looking at a nice Raymarine system showing the boat going through a sea wall 200 feet west of our actual position. Yesterday while motoring in the ICW channel in Santa Rosa Sound near Navarre, FL, the chartplotter boat took out several of the buoys on the right side of the channel. Dennis C. Touché 35-1 #83 Mandeville, LA Currently on the hook at 30 23.054N 86 51.884W Sent from my iPhone ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List Navigation
From what I have read, intentional inaccuracies of GPS was a real thing. It was called Selective Availability and it was switched off around 2000 by the Clinton Admin. This made civilian GPS accurate to 20 meters +- .The inaccuracies we see now are the result of atmospheric and electromagnetic which distort the timing of the signals from the satellites. This can be augmented by Differential GPS, WAAS and other systems which provide ground based timing corrections. I'm fine with that much accuracy. Cheers Brent 27-5 Lake Winnipeg. Sent from my iPhone On Dec 6, 2014, at 9:18 PM, Joel Aronson via CnC-List cnc-list@cnc-list.com wrote: Civilian GPS equipment is intentionally less accurate than military equipment. Your government doesn't want you to know exactly where you are! Joel On Saturday, December 6, 2014, Rick Brass via CnC-List cnc-list@cnc-list.com wrote: Hope you are having a great, and warm, weekend, Dennis. It is rainy, gray, and the high was about 60 in NC today. Not a nice day for boating. We have all experienced the sort of GPS errors you mentioned at one time or another. And because we all know that our GPS receiver can calculate out position to an accuracy of 30 feet or so, we tend to think that the charts are wrong. But that might not be the whole truth. I’d bet NOAA had pretty good GPS location numbers on the buoys you “hit”, and is not far off on the position of the seawall. The 10 to 30 foot accuracy our GPS reports is based on things like the number and position of the satellites from which it is getting signals, allowing for things like the accuracy of its internal clock, inaccuracy in the chart datum, and the radio waves that carry the time signals from the satellites getting “bent” by the Earth’s magnetic field. But there is another variable that the GPS can’t allow for. I remember reading, a few years ago, about the GPS system in one of the science magazines aimed at geeks like me (Probably Scientific American or Air and Space, but I can’t recall for sure). Seems the GPS system is a good example of Einstein’s Theory of Relativity. Part of the theory says that when you go faster, time slows down relative to time measured in a location that is moving more slowly. The GPS satellites are traveling at something like 18000MPH faster than we are on the Earth’s surface. So the atomic clocks on the satellites “tick” just a wee bit more slowly than the clock on earth. There is a government facility outside of Omaha where military personnel are tasked with adjusting the clocks on the satellites, by a few microseconds or nanoseconds, several times per day to maintain the accuracy of the time signals relative to the earthbound time. As I recall, if the clocks were not adjusted for 24 hours, the calculated position of a spot on Earth would be off by something like 5 miles. That’s probably more than you wanted to know. But you can probably chalk up all those buoys the chartplotter boat ran into to Albert. Oh, and another bit of Einstein trivia: He issued the original patents for the recipe for Tolberone Chocolate, and the shape of the candy. Which is not boating related, unless your Admiral likes really good chocolate. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dennis C. via CnC-List Sent: Monday, December 01, 2014 8:48 AM To: Della Barba, Joe; cnc-list@cnc-list.com Subject: Re: Stus-List Navigation I was motoring up a harbor looking at a nice Raymarine system showing the boat going through a sea wall 200 feet west of our actual position. Yesterday while motoring in the ICW channel in Santa Rosa Sound near Navarre, FL, the chartplotter boat took out several of the buoys on the right side of the channel. Dennis C. Touché 35-1 #83 Mandeville, LA Currently on the hook at 30 23.054N 86 51.884W Sent from my iPhone -- Joel 301 541 8551 ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Stus-List CC 41 Charter
We have a 41 available for skippered charter in Gulf Islands for cruising or rendezvous. Sent from my iPad ___ This List is provided by the CC Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
Re: Stus-List Navigation
There's nothing to this GPS navigation :Sail in the white ; Anchor in the blue ; Drink in the brown!How difficult can it be? sam :-) From: Dennis C. via CnC-ListSent: Saturday, December 6, 2014 9:00 PMTo: Rick BrassReply To: Dennis C.Cc: cnc-list@cnc-list.comSubject: Re: Stus-List NavigationActually, a front coming through tonight is dropping the the temp dramatically. :)As for the navigation thread, we were motoring a narrow section of the ICW before sunup this morning. Although Touché was in the middle of the "ditch", the GPS showed us about 150 yards north in the pine trees.Further in the ICW, the graphical depiction of the channel did not match the markers or our location. That is, the different colored channel was outside the markers. The markers appeared accurate.So, much of the inaccuracies we see are in the GIS data in the maps. I'd bet that if I'd plotted the location from the GPS position data on a paper chart, I'd have been in the channel and not in the woods.Gas wells in Mobile Bay were close to the charted positions.My auto steerer is always pretty much dead on because the waypoints I use are all observed. That is, they were set from actual boat position using the "mark" function of the GPS. Some were set several years ago. The fact that the GPS via the auto steerer brings me back to them accurately after several years is verification of the accuracy of the GPS system.Dennis C.Touché 35-1 #83Mandeville, LASent from my iPhoneOn Dec 6, 2014, at 8:58 PM, "Rick Brass" rickbr...@earthlink.net wrote:Hope you are having a great, and warm, weekend, Dennis. It is rainy, gray, and the high was about 60 in NC today. Not a nice day for boating.We have all experienced the sort of GPS errors you mentioned at one time or another. And because we all know that our GPS receiver can calculate out position to an accuracy of 30 feet or so, we tend to think that the charts are wrong. But that might not be the whole truth.I’d bet NOAA had pretty good GPS location numbers on the buoys you “hit”, and is not far off on the position of the seawall. The 10 to 30 foot accuracy our GPS reports is based on things like the number and position of the satellites from which it is getting signals, allowing for things like the accuracy of its internal clock, inaccuracy in the chart datum, and the radio waves that carry the time signals from the satellites getting “bent” by the Earth’s magnetic field. But there is another variable that the GPS can’t allow for.I remember reading, a few years ago, about the GPS system in one of the science magazines aimed at geeks like me (Probably Scientific American or Air and Space, but I can’t recall for sure). Seems the GPS system is a good example of Einstein’s Theory of Relativity. Part of the theory says that when you go faster, time slows down relative to time measured in a location that is moving more slowly.The GPS satellites are traveling at something like 18000MPH faster than we are on the Earth’s surface. So the atomic clocks on the satellites “tick” just a wee bit more slowly than the clock on earth. There is a government facility outside of Omaha where military personnel are tasked with adjusting the clocks on the satellites, by a few microseconds or nanoseconds, several times per day to maintain the accuracy of the time signals relative to the earthbound time. As I recall, if the clocks were not adjusted for 24 hours, the calculated position of a spot on Earth would be off by something like 5 miles.That’s probably more than you wanted to know. But you can probably chalk up all those buoys the chartplotter boat ran into to Albert.Oh, and another bit of Einstein trivia: He issued the original patents for the recipe for Tolberone Chocolate, and the shape of the candy. Which is not boating related, unless your Admiral likes really good chocolate. Rick BrassWashington, NCFrom: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dennis C. via CnC-ListSent: Monday, December 01, 2014 8:48 AMTo: Della Barba, Joe; cnc-list@cnc-list.comSubject: Re: Stus-List NavigationI was motoring up a harbor looking at a nice Raymarine system showing the boat going through a sea wall 200 feet west of our actual position.Yesterday while motoring in the ICW channel in Santa Rosa Sound near Navarre, FL, the chartplotter boat took out several of the buoys on the right side of the channel.Dennis C.Touché 35-1 #83Mandeville, LACurrently on the hook at30 23.054N 86 51.884WSent from my
