GPS 12 date error

[Kurrawong_Kid]

I have a Garmin GPS12 which I rarely use. Fired it up on Saturday and it found the correct position but said it was 17th.(?) March 1994! Time was correct. Otherwise worked fine. Fired up again on Sunday, still working OK but same incorrect date. Manual states that date should automatically set itself. Anyone know of a fix for this glitch or why it is happening?
Thanks.

 

[nigelmercier]

How long did you leave it on for?

 

[[70521]]

How long did you leave it on for?

The GPS needs to re-build its internal tables from the data it picks up from the satellites.

Switch it on and leave it for a few hours.

 

[geoid96]

I think this may be a GPS week rollover issue.

17 March 1994 is GPS Week 0740 day 4. The GPS week rollover occured on 22 Aug 1999 (GPS week 1024). Today it is GPS week 1764. 1764-0740 = 1024.

My guess is that you GPS12 is counting the time from GPS start date (7 Jan 1980), not from the rollover date. This may be resolved by a firmware update available from:
http://www8.garmin.com/products/gps12/download.html

 

[AntarcticPilot]

I think this may be a GPS week rollover issue.

17 March 1994 is GPS Week 0740 day 4. The GPS week rollover occured on 22 Aug 1999 (GPS week 1024). Today it is GPS week 1764. 1764-0740 = 1024.

My guess is that you GPS12 is counting the time from GPS start date (7 Jan 1980), not from the rollover date. This may be resolved by a firmware update available from:
http://www8.garmin.com/products/gps12/download.html

That was my immediate reaction, as well. I'm sure that is the problem.

 

[nigelmercier]

I think this may be a GPS week rollover issue.

I'm impressed. No, really

 

[Bilgediver]

Might be worth trying this.


http://gpsinformation.net/main/eowgarmin.htm

 

[Kurrawong_Kid]

Many thanks to all of your help, especially geioid96 and Antarctic Pilot. Will try the downloads and try my luck!

 

[davidpbo]

My trusty Garmin GPS Map 76 looked like it was terminally ill.

I think I selected the "Stored Without Batteries" option on power up which cleared it.

If it doesn't sort itself out leaving it on try taking the batteries out for 24hrs and try powering up and selecting the "Stored Without Batteries" option if it appears.