[amsat-bb] Re: Playing with GPS

[Glenn AA5PK]

Garmin claims 15 meters average accuracy on their Web site.
http://www8.garmin.com/aboutGPS/

Glenn AA5PK

----- Original Message ----- 
From: "Nigel Gunn G8IFF/W8IFF" <nigel at ngunn.net>
To: "Lee Ernstrom" <iamsavedbygrace at q.com>
Cc: <amsat-bb at amsat.org>
Sent: Sunday, July 25, 2010 6:37 PM
Subject: [amsat-bb] Re: Playing with GPS


> Nobody guarentees your GPS to be accurate to within 30 feet and neither does Google maps.
> My GPS usually claims around 10-12 feet accuracy provided it can see around 10 satellites.
> Leave your GPS on laying in your yard for a couple of hours plotting it's course and see how far it wanders.
> 
> On 25-Jul-10 22:55, Lee Ernstrom wrote:
>> Hi Guys,
>>
>> I have been playing around with my Garman NUVI GPS and comparing the
>> readings to Google Maps.  This is something you call try at home.  My
>> Garman says that the base of my HF tower is at 41.07430 N 112.03774 W.
>> When I punch in those coordinates in to Google Maps in the satelite view
>> mode the arrow points to a location about 30 feet away near the middle
>> of the lawn east of my driveway.  When I play around with the
>> coordinates a little through interpolation and punch them in to Google
>> Maps several times I arrive at what appears to be the true coordinates
>> of the base of my HF tower at 41.074329 N 112.037770 W.  I suppose that
>> is the significant difference that sixth decimal place makes.  Check
>> both of these coordinates on Google Maps to see what I mean.  Any
>> comments?
>>
>> WA7HQD
>> Lee Ernstrom
>> Syracuse, Utah DN31xb
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>>
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> 
> -- 
> Nigel A. Gunn,  1865 El Camino Drive, Xenia, OH 45385-1115, USA.  tel +1 937 825 5032
> Amateur Radio G8IFF W8IFF (was KC8NHF),  e-mail nigel at ngunn.net       www  http://www.ngunn.net
> Member of  ARRL, GQRP #11396, QRPARCI #11644, SOC #548,  Flying Pigs QRP Club International #385,
>            Dayton ARA #2128, AMSAT-NA LM-1691,  AMSAT-UK 0182, MKARS,  ALC, GCARES, XWARN.
> 
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