So i have a duck boat, a 14' livingston with remote steering windshield and such. Ive hunted the skagit bay with my buddies in their boats and they have depth sounders/ map plotters. They are fishermen in the boats but I am not. Perhaps the occasional Crabbing trip. What is the best bang for the buck lower tier eletronic to purchase for the boat? The gps plotter has been really useful when finding the deeper part of the channel or the log we tied up to the last time the weather was right.