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000376_dold@GPSXNMEAXt.usenet.us.com_Wed Sep 1 11:02:45 2004.msg
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Path: newsmaster.cc.columbia.edu!panix!newsfeed.mathworks.com!newsfeed2.dallas1.level3.net!news.level3.com!news.mainstreet.net!wasp.rahul.net!blue.rahul.net!not-for-mail
From: dold@GPSXNMEAXt.usenet.us.com
Newsgroups: comp.protocols.kermit.misc
Subject: GPS NMEA time reader
Date: Wed, 1 Sep 2004 14:26:41 +0000 (UTC)
Organization: a2i network
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Sender: Clarence Dold <dold@green.rahul.net>
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I have a commodity GPS (Garmin eTrex)
This produces NMEA strings at 4800 baud that I can read easily with
Kermit95.
A string that starts with $GPRMC contains the date and time in GMT.
The strings appear every few seconds, with a granularity of +/-2 seconds.
What I want to do is read these with Kermit95 and use them to set the time
and date on a Windows PC. The fact that it is GMT is a little bit of a
problem, and I thought someone else might already have done the work for
me.
If the script also worked on MSDOS and Unix, that would be great. On Unix,
I think the GMT offset is not a big deal, but I don't know what to do on
Windows/DOS.
This is from 010904 September 1, 2004, at 13:40:58 GMT
Once satellite lock is found, the position appears
$GPRMC,134058,A,3850.1234,N,12230.5678,W,0.0,71.4,010904,15.0,E,A*0D
------ ------
Before satellite lock is found, there is no position, and no time.
The ",V," indicates that the fix is no good.
$GPRMC,,V,,,,,,,010904,15.0,E,N*00
--
---
Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8-122.5