[Rich]

The battery in discussion here is in the GPS sensor, that may be mounted on a pole, on your radar arch, or on top of your boat somewhere.

I don't think there is one in the L1250, but I don't have one, nor checked the manual. You may want to see if there is a Restart GPS command available via a GPS Status page on your L1250.

You may want to check your seatalk or nmea status pages to see if the unit is receiving data from the GPS sensor. It could be just a fuse or a switch that is turned off somewhere.

But if the unit is this old, and there is a battery in the GPS sensor, it may need to be replaced. Raymarine will tell you to buy a new GPS, as they say they will not service the older GPS sensors anymore.

Let us know what happens.