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Gudmundur
 
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In article ,
says...

Yes its the plotter overlay on the radar screen that's locking up


OH MAN, I forgot the simplest explaination. The GPS doesn't know
where it is!!! It will send a data string of where it was last powered
off at. If that is not where it is currently located (like you moved
the boat several miles with the GPS powered off) it will send a 'NO
VALID POSITION FIX' data string until it figures out where it really is.
this can take up to 30 minutes!!! Always repower the GPS in the location
where it was powered off. Don't go out to sea 5 miles and then switch it
on. It will flounder typically 10 minutes to re-establish position.