[OZAPRS] VK2 Network Update

[Tony Hunt]

Sorry Geoff and Shaun.. Not quite right as I see it..

> $GPRMC contains position and elevation.
> $GPGGA contains position and speed.

Check out this informative web site.
http://home.pacific.net.au/~gnb/gps/nmea.html

I think you will find GGA contains Altitude and position and RMC has Speed
and position amongst other things.. For APRS I generally use RMC and if
the
devices are capable of more I will also run GGA as well ..

Tony  Hunt VK5AH


----- Original Message ----- 
> Date: Fri, 2 Nov 2007 12:01:40 +1100 (EST)
> From: geoff at gatwards.org
> Subject: Re: [OZAPRS] VK2 Network Update
> To: "VK / ZL  APRS Users" <ozaprs at aprs.net.au>
> Message-ID: <1663.203.166.5.140.1193965300.squirrel at home.gatwards.org>
> Content-Type: text/plain;charset=iso-8859-1
>
> Hi Shaun,
>
> $GPRMC contains position and elevation.
> $GPGGA contains position and speed.
>
> If you want to be able to view position, elevation and speed, you need
to
> use both strings to extract all the required data from the NMEA
sentances.
>
> Using two of the TNC's LT buffers allows the TNC to send alternate
beacons
> with speed/elevation.  The client apps will see the elevation update
every
> 2nd beacon, and the speed every 2nd alternate beacon.
>
> You could of course use only $GPGGA if you were only interested in your
> posit and speed.
>
> Regards,
> Geoff.
>
>
> >
> > Awesome website.  Very informative and well set out.
> >
> > Could I ask what the theory is behind one $GPGGA and one $GPRMC
sentence
> > in the mobile set up?
> >
> >
> >
> > Regards,
> > Shaun Pitcher
> > spitcher at energy.com.au
> >

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