Curtis;
First off, I'd suggest your local US Power Squadron chapter and see about taking a basic "Piloting" course. It will teach you how to calculate tides and currents from available information, and how to include these into your course planning. There is a squadron in Beaufort www.usps.org/localusps/beaufort and another in Hilton Head Home - Hilton Head Sail <http://www.hhsps.org/> & Power Squadron both of which see close to you. Second, you see to have your waypoints off a bit. You said turn east from R4, to a new waypoint of 32 29.988N 80 29.988W. That waypoint is 28 NM from the R4 marker at 010 degrees. I think you mean 34 05.988N 80 29.988W. Using that new waypoint, I end up with a total cruise of about 56nm, which is close to what you had intended. You indicated you would plan to do the trip sometime in March, so I used tide and current data for March 1st and 2nd in evaluating the trip. High tide at the tide station under the bridge next to your marina is +8.2 feet at 8:50AM on March 1st. You can expect the ebb to be near 0 kt shortly after that, increase to a maximum of 1.4 kt for about 3 hours, and then drop back to 0.2 kt near low tide. So for the first 20-21 NM out to the R4 marker, your speed over ground should be about 6.5 kt, and your ETA at the sea marker will be about 3 hours and 15 minutes after departure, call it between noon and 12:15. Low tide at the station closest to the R4 mark (which is on Hilton Head) is -1.58 feet at 2:46 PM. That gives you about 3 hours to complete the triangular portion of your trip at sea, which is about 13-14 nm. You need to average about 4.6 kt, which is about what I plan on averaging when sailing. So that triangular loop looks doable, and should get you back to the neighborhood of R4 around low tide. You shouldn't notice much impact from currents while this close to shore. Going back up the sound, the flood will start out at about -0.2 kt (that is the base current near Hilton Head) and increase to a max of 1.2 kt somewhere around 5:15 PM, then drop off to slack water near high tide, which is 9:15 PM at your marina. Call it an average bump of about 1/3rd kt. So going back up the sound you should be able to make about 5 kt sailing, or a scosh under 6 kt motoring if you have a North wind. So if you make the R4 mark around 3:00 PM, your ETA home is somewhere between 6:30 and 7:30 PM. Sunset, for you, on March 1st is about 6:34 PM. Hope the trip works out well for you. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Curtis Sent: Monday, January 06, 2014 1:23 PM To: CnC-List@cnc-list.com Subject: Stus-List Near-shore tide what to expect. "Need some Guidance" So I'm as some of you know in the process of moving to the next step in my training. I'm in the planing stages of my first over-night near shore passage. I will leave early am: 4:00 with a full moon to help and head out to the "R 4" F1 R4s @ 32-05,901"N 080-35,099W this is the channel into Port Royal sound Beaufort SC. I intend to sail out with the tide its a 19 mile ride I figure 5.5 knots of speed? That will put me there at Day break or just after 3.45 hrs. Then run straight east for 5nm to 32-029'899N 080-29'988 W That will take a nother 90 min, Here, I will turn south to 32-03,997W 080-29'167W 1.92 miles = 34min Here i will turn back west to 32-03'984W 080-34'965w this 4.92 leg take .89 min Then I will turn North to will bring me the 4.92 nm back to to the "R 4" F1 R4s @ 32-05,901"N 080-35,099W the bell marker at the mouth of the channel. Then my hope will be to take the the Tide back in. So here is the question." If I do this near shore how much will the tide effect my timing in the course: I plugged in the 5.5 based off motor speed. All together time from the dock and back to the dock. 10.956 hours to cover 60.26nm How much time will the tide cost me off shore? I know a bought the tide in and out of the river. Just need help with the offshore expectation? Thanks again. let me know if you need more information. LT -- "Sailors, with their built in sense of order, service and discipline, should really be running the world." - Nicholas Monsarrat
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