Hats off to Garmin !!!
I have a garmin gps III. I left it without batteries in for a few days, next time I try to use it, it cant find any satellites.
I spoke to garmin and it seems they had a fault with the internal battery and it had lost the almanac data, which could not be reloaded. The unit was more than two years old and I thought I was going to have to buy a new one. But no, Garmin told me to return it and they sent me a new one free of charge, which I still have to this day.
Thanks garmin, Nick.