Garmin GPS 10 -- NMEA Question

Hi, recently a friend of mine and I have been working on implementing
support for this device in the Android.
My question is in regards to NMEA data being sent from the device
itself. We have set the device to only send us $GPRMC sentences and
that seems to working properly. The main problem that we are
experiencing is that the Latitude and Longitude aren't updating and
are pointing to a location in Taiwan where coincidentally the device
was manufactured. So much so that a search on google turns up that
this location is close to the Garmin manufacturing plant.

My question is how can we ensure that GPRMC updates? This is a bit
frustrating but we're trying everything we can.

Thank a lot in advance and long live Usenet!

-Thomas Donahue
-Michigan Technological University

I think that would continue to be true on a brand new Garmin device that
has never achieved a satellite lock.

You need to take the GPS outside, and let it sit for a while, somewhere
between five and fiftenn minutes, until it gets a satellite lock.
After that, it should give current location.

Have you verified the $GPRMB to see if it is reporting satellite lock?

Some snippets from a Garmin eTrex

Good satellite lock
$GPRMB,A,,,,,,,,,,,,A,A*0B

Altitude 538 feet
$PGRMZ,538,f,3*15

$GPRMC,022816,A,3826.7401,N,12243.8454,W,7.8,80.2,200302,15.4,E,A*05
At 02:28:16 GMT, Valid Position, 38m 26.7401s N, 122m 243.8454s W, 7.8 mph,
80.2 True Heading, 20Mar02, 15.4 mag declination, East declination,
Checksum

Field 2 might be "v", invalid data, in your case.

http://vancouver-webpages.com/peter/idx_garmin.html
http://www.gpsinformation.org/dale/interface.htm#nmea
might be a good place to look.

--
Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

On May 25, 9:03=A0pm, d...@28.usenet.us.com wrote:
h,
ion.org/dale/interface.htm#nmea

Clarence, thanks a ton for this. My friend tested the device last
night and was able to get a good connection to the satellites. We
calculated the position today and lo and behold we were able to get a
close to pin-point accurate spot.

Do you have any recommended way of converting ddmm.mmmm to decimal
degrees? We found that if we treated the format as ddmm.mmss it
worked a lot better for getting accuracy at the location we were at.

-Thomas Donahue

Program much? Dude, it's arithmetic!

On Wed, 26 May 2010 09:17:53 -0700 (PDT), Bad Idea


One of the best answers ever. :-)