[time-nuts] Crude Survey Technique

Brooke Clarke brooke at pacific.net
Thu Nov 21 17:46:44 EST 2013


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, <TMiller at 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-bounces at febo.com <time-nuts-bounces at febo.com> on behalf of Brian Lloyd <brian at 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, <johncroos at 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
>> brian at lloyd.com
>> +1.916.877.5067
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