FWIW, my Garmin Nuvie 40 (el cheapo) only takes moving maybe 10' to get a rough compass direction. I doubt it has any gyro or accelerometers.
-John =============== > 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 >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> ________________________________ >>> CONFIDENTIALITY NOTICE: The information contained in this electronic >>> message is confidential information intended for the use of the >>> individual or entity named above. 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