PSN-L Email List Message

Subject: Re: WinPlotGPS
From: "Larry Cochrane" lcochrane@..............
Date: Wed, 28 May 2003 21:00:15 -0700


Ian,

> Hi,
>
> I've only just discovered this program(!) and tried it with my Delorme
> Earthmate.  I couldn't get it to work, probably for configuration reasons.  I
> know the unit is working as I can use it with my palm pda.  There are a few
> questions and suggestions I'd like to make:
>
> Is Earthmate compatible with one of the known devices or should I pick
> Settings|Options|GPS Type: Other ?

You should use Other for your GPS receiver.

>
> What are the implications of choosing Other?

No predefined initialization command is send to the receiver.

>
> Not having a spec for my Earthmate I don't know what baud rate it's running
at,
> does anyone know?  I could just plug it in and run Hyperterminal to try to
get
> it.

If the Earthmate outputs standard NMEA messages, the baud rate should be 4800.

>
> My pda shows the bytes streaming from the receiver.  Whilst this is just
> gobbledegoop (to me) it's very useful in that it shows that the device is
> running and the bytes are getting in to the software.  This would be a useful
> addition to WinPlotGPS (maybe it already has this feature(?))
>

To view the data from the GPS receiver open the NMEA Display window using the
View / View Messages menu items.

For WinPlotGPS to work with  the Earthmate receiver, the receiver must output
the follow NMEA messages $GPRMC, $GPGGA, $GPGSA and $GPGSV.

In the message viewer window you should see GPS messages like this:

$GPRMC,150649,A,3706.7209,N,12127.0521,W,184.2,130.1,280602,14.8,E*5B
$GPGGA,150649,3706.7209,N,12127.0521,W,2,03,2.0,4779.3,M,-28.3,M,,*48
$GPGSA,A,2,,06,,,,,23,,,,47,,2.2,2.0,1.0*34
$GPGSV,3,2,11,17,39,256,51,18,07,201,38,23,58,153,46,24,16,056,00*7C

Hope this helps. Let me know if you get it working,

Regards,
Larry Cochrane
Redwood City, PSN



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