[time-nuts] Crude Survey Technique

J. Forster jfor at quikus.com
Thu Nov 21 18:15:48 EST 2013


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, <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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