Well, I'm not very good at operating the radar, but I know this much:
It doesn't do so well in rough seas, and will keep turning itself off if water comes over the conning tower. That could also be the cause of your disappearing contact problem, too. Just a guess on the latter, though.
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Idaho-
-I like to play poker with Tarot cards. The other night I got a full house, and 4 people died.
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