Hi Neville:
Most low cost hand held and car GPS receivers can only display direction based
on changes in position.
While on vacation in Japan I was using a hand held Garmin 12-channel GPS, but when standing still the compass did not
work, I needed to run a block to get a bearing.
My Honda van GPS includes a gyroscope so it know you have turned even in an urban canyon where there may not be enough
satellites visible to get a fix.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Neville Michie wrote:
How do the car mounted GPS guidance devices find North?
Is it by deciding which direction you are moving on the map that they have
stored?
It is amazing how quickly they show the orientation of the map/your direction
of travel.
Do they have a sensor to register when you turn a corner?
What they do does not seem possible from just a series of position fixes.
cheers,
Neville Michie
On 22/11/2013, at 7:45 AM, <tmil...@skylinenet.net> wrote:
If you want true north, set up a camera that has time or bulb shutter at the
south end of your property. Put in a marker stake. take a time exposure at
night with the camera facing north. If you expose for about 30 minutes, you
will get a landscape with the stars rotating around the north star. You can
then mark the north location on your property under the north star.
A compass siting can give the mag north.
________________________________________
From: time-nuts-boun...@febo.com <time-nuts-boun...@febo.com> on behalf of Brian
Lloyd <br...@lloyd.com>
Sent: Thursday, November 21, 2013 2:04 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Crude Survey Technique
On Thu, Nov 21, 2013 at 12:52 PM, <johncr...@aol.com> wrote:
I wish to establish a north south line on my property to an accuracy of
+/- 2 degrees.
Could this be done by loading a T-bolt, Antenna, Power source, and laptop
into my
little red wagon? The idea being to find two positions several hundred ft
apart where either LH or T-bolt Mon report the same latitude? Will either
of these programs report to sufficient accuracy? The base line would be 300
ft, though more is possible.I realizes that the T-bolt is not a survey
device, but I can spend several hours fixing each position if required.
True north or magnetic north? In any case, a good lensatic compass and
knowing your magnetic variation should easily get you to within 2 degrees
and is a lot easier than doing a survey with your GPS.
--
Brian Lloyd, WB6RQN/J79BPL
706 Flightline Drive
Spring Branch, TX 78070
br...@lloyd.com
+1.916.877.5067
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