[aprssig] Garmin NUVI & messaging?

Scott Miller scott at opentrac.org
Wed Feb 16 16:10:57 EST 2011

On 2/16/2011 5:30 AM, Pentti Gronlund wrote:
> Scott Miller writes:
>>  For the D700 you'd be using the GTRANS cable, though, which doesn't
>>  enable FMI mode and just uses the same connection to get position data
>>  and send waypoints.
> Scott,
> Is the format that GTRANS uses with Garmins published somewhere?
> 73 de Benjamin OH3BK

I'm not sure what you're asking... the FMI protocol is documented on 
Garmin's site.  On the serial side, the GTRANS uses $GPWPL (NMEA 0183) 
and $PKWDWPL (not publicly documented that I know of), and KPC-3 style 
packets.  It puts out $GPGGA, $GPRMC, and $GPGLL.


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