Roll your leg over....
The first reply (Rick's) probably meant to say change the date to 1980 (Y0K for GPS). GPS uses a memory block of 1024 weeks (just like your computer's memory of 1 Kbts=1024 bytes). Since the GPS week started on Jan 1, 1980, 1024 divided by 52 weeks/year equals about 19.7 years or Aug 22, 1999. This is a simplification of the issue. And even if you could set your GPS to 1980, I don't believe your GPS unit would work right.My Garmin GPS 75 was running at midnight GMT (8 PM East Coast time) and did all right. I did not notice anything wrong but I only left it running about 10 more minutes. Restarting it the next day and it took a long time to acquire the satellites. I had to restart it with the zero held down (just like Garmin said in their web page) and it acquired the satellites in about 15 mins. I could have downloaded some software to solve this problem but I don't have a computer to GPS cable. I could also do a master reset but that would wipe out all my stored waypoints. I will live with a slow start up for the next month when this problem inside my GPS unit will no longer be an issue. This EOW (End of Week) is not a GPS problem; it is a problem with how my GPS UNIT deals with the GPS calendar as it is!