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
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 _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3026 - Release Date: 07/24/10 18:36:00
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@ngunn.net To: "Lee Ernstrom" iamsavedbygrace@q.com Cc: amsat-bb@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 _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3026 - Release Date: 07/24/10 18:36:00
-- 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@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.
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
That's around 45 feet, I believe the owner of the GPS network only claims half that accuracy most of the time.
On 26-Jul-10 00:19, Glenn AA5PK wrote:
Garmin claims 15 meters average accuracy on their Web site. http://www8.garmin.com/aboutGPS/
Glenn AA5PK
Hi Lee,
Thanks for your observation. I remember in those days when the accuracy wasn't that great, and the GPS were rather rare. Showing his newly acquired GPS and showing off the exact positon , well nearly.
"OK I will tell you now where we are"
"We are on that hill pointing a mile away"
Well in your case at least you could see your tower hi.
Happy hunting
73
Sangat, 9M2SS
On 26 July 2010 06:55, Lee Ernstrom iamsavedbygrace@q.com 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 _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (4)
-
Glenn AA5PK -
Lee Ernstrom -
Nigel Gunn G8IFF/W8IFF -
Sangat Singh