sleepy navman

My set up is an ipac 38XX, with the ipac navman jacket and copilot 1.2 purchased 2 years ago. System works fine enough but loose's track of all signals at 7 o'clock every evening on the dot. Anybody else had this problem, How did you resolve.

[Charlie]

Welcome to our forums.
That's a new one on me, do you have anything schduled for that time? Have you tried a hard reset then re-install?