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It seems your map data(base) may have been corrupted. Have you tried restoring the data from your backup ?
or you can try running a (fix) disk utility against your (internal or external) storage disk for the GPS ?
For instance, connect the GPS to your PC (Windows), and select (highlight) the (internal) "disk" on the GPS device. Under File - Properties, go to the Tools (tab) and run the "Error-Checking" option.
Running this utility may fix your map data error.
If not, you'll want to get a new map ...
make sure the gps have a full view of the sky. leave it in aquiring mode and let it sit there. My Emap took up to 35 mins once to reaquire the sats and get the updated info needed for position info.
if the unit has been off for a long time or moved a long distance from where it was last turned on, it can take a while for it to come back up.
It can take a long time to get a GPS fix for the first time on a phone, either when new or after repair, as the memory will have been wiped. Leave the phone somewhere with a good view of as much sky as possible, with the GPS active for half an hour, and it will download the satellite data again. Then next time it should get a fix more quickly.
If your phone has an application for assisted GPS that downloads the satellite data from the internet, try running this.
Sometimes, there can also just be bad times for getting a fix, if the satellite geometry is bad.
On the 760 unit, I would try:
After resetting GPS user data, make sure the problem still exists before proceeding.
1. Resetting GPS user data-
At the user menu press the zoom out key (-) and the repeat button at the same time. Once the menu appears select reset GPS user data (that may or may not be verbatim but it's not the Reset user data one).
2. Reset user data
Resetting user data will cause you to lose all of your POI's and user information, which of course can be re-entered manually. So, depending on how much info you have on your unit and if the time delay is that much of an issue you can do the same process as before except this time do select reset user data.
3. Check RF cable connections
This involves opening the unit up. This is at your own risk. Once the screws are out you will see a either gray or black cable going from the main board to the I/O board (the board screwed into the rear housing) Check both sides of this cable as the side on the I/O board has a history of either coming undone or the soldering on the I/O board connector is loose. Unplug each side of the RF cable to make sure the solder connections are solid. If this is the problem, then you need to either find a soldering iron or find someone who can re-solder it for you. This is not an uncommon find in the 760's.
Hope this helps!
I had a similar problem, and Garmin recommended that I reset the user data by holding "Power" and "Esc" when you turn on the unit. I think it remedied my problem to some extent. However, note that this will indeed delete all of your waypoints and other data, so be sure to back them up somehow (even if it means manually writing down the waypoint coordinates and re-entering them later) if you don't want to lose them. Good luck.