'Cannot locate navigation file 'message. HELP! Where have my maps gone? (XL488, SL350D, SL350F)

You need to reset the Navigation path - it's really simple and you don't need any computer knowledge. To explain - your maps are stored in onboard memory in your SL350F (think files in the C: Drive on your PC). But your SL350F is looking for an SD card in the Card Reader slot. You just need to redirect it

In the Main Menu

1. Single tap SETTINGS  (the little rectangular box - bottom left corner of the screen)

2. Single tap APPLICATION  (top of left column with a spanner picture)

3. Single tap the MAGNIFYING GLASS icon

4. Double-tap the NANDFLASH folder to open it

5. Double-tap the LOGIC GEAR NAVIGATION folder to open it

6. Scroll down to the logicgearnavigation.exe file (blue world globe with circles) and double-tap

This takes you back to the Application screen - just use the white return arrow (top left) to go back to the main menu and tap GPS  - you'll be straight in.