Before leaving your boat in storage for the off season, you should go through and remove any valuables and electronics. Electrical items tend to suffer in cold weather, even when disabled, so taking them home to a climate controlled space can prevent problems the next season. You should also pack up all safety devices, flares, fire extinguishers, and flotation devices. Winter is a good time to look over these items and make sure they are in good working order and clean or replace them as necessary.
Safety First!!