Hi me little Marsupial...
Firstly - I CANNOT begin to imagine a scenario where the whole system fails inc redundancy...
But, you asked, so . .. 'far offshore' heave to and sleep, fix it in the morning, no worries. more likely fire up a laptop and take a peek.. or, get the last position log from the gps loggers on a backup battery, transfer it to Encarta world atlas 
As I said in another post.. if you KNOW you can fix the electrical system - whatever happens - and you have the redundancy - its not on the scale of anything to lose sleep about. Joe
-------------------- PM me for info re SSB's etc. Bought, sold, repaired, fitted and optimised.
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