Test 1 : Remove any map card and test ...
Test 2 :
Boot the unit in Demo mode
Press Menu twice to get into the main Menu
Cursor over to the Setup tab
Cursor down to Restore Defaults
Cursor right to activate Restore Defaults
Test operation
Test 3 :
Boot the unit in Demo mode
Press Menu twice to get into the main Menu
Cursor over to the Setup tab
Cursor down to Format Nav directories
Cursor right to activate Format Nav directories (any waypoints saved will be deleted)
Test operation
If the issue persists - the unit will have to visit Humminbird ...
1-800-633-1468
Rickie