[OZAPRS] VK2 Network Update

[Geoff]

Hi Tony,   

Correct - I wrote them down in the wrong order :-(     
Depends on personal preference as to what you use - if you look at the
PMON
screen of a D700 you'll see both GGA and RMC strings from the GPS being
used
to compile the posit data, so all combinations are valid, depending on
what
you want to see.

Geoff  VK2XJG


-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Tony Hunt
Sent: Saturday, November 03, 2007 6:21 PM
To: ozaprs at aprs.net.au
Subject: Re: [OZAPRS] VK2 Network Update

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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