Based on your description I would suspect that the internal memory battery is depleted and needs to be replaced. This battery is required to retain waypoint and route information when the input power is low or turned off. The battery is soldered onto the main circuit board and needs to be replaced by a technician having good soldering skills and access to instructions for the disassembly and reassembly of the unit. There is a list of dealers on the Northstar website. Review the list and make a couple of phone calls to see which ones will do bench work on this unit.
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1. Turn your Nuvi unit off, remove any SD cards from the SD card slot
and make sure that the unit is not plugged into any computer. Step
2. Place a fingertip on the upper left hand corner of the touch screen
and keep it there while turning the unit on, a prompt should read " Do
you really want to start in maintenance mode?" Step 3. Select the yes button. Step 4. Enter your PIN if enabled. Step 5. Main Maintenance Mode screen should have 4 selections: System information View Diagnostics Clear User data Clear Waypoints Step 6. Choose "Clear Waypoints". After some time the unit should reboot.
Mine did the same, and said no gps no fix. I called the factory, now called Northstar, tech said to reset unit, and it worked. Great signal strength. Turn unit on and access menu, access factory settings,hit factory reset. However you will lose all your waypoints.
With the charts page up, start by hitting the find ship softkey at the bottom of the screen.If that find the boat on the chart all is good.If not you need to check you have a GPS fix. Go to GPS screen and see you are seeing satalites.
If all is good when you hit find ship and the boat disappears again from chart while underway you will need to go into the chart setup menu and see if the screen amplifier is turned off. If off turn on.This is first place to start. Hope that helps