I have a second cable that plugs into 12 V outlets in the cabin so I just
bring the GPS below.

However, I sleep right through its alarm. It just isn't loud enough. The
funny thing is, I wake up for things like the motion of the boat changing
when the tide turns. I just haven't been able to train my mind to put that
little electronic beep on the list of things to keep track of while I'm
sleeping.

--
Roger Long