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I have the Furuno 1623 and can pick out loster traps, boats, rocks just about anything on the surface. The installation and setup of the unit can make up for what some say are the shortcomings in power and screen size. It navigated Robertsons Hole and The canal at least twice in visibility of less than 1/4 mile. Picked up groups opf boats working 5 miles away and even picked up birds at 1 mile in fog. You can not be too familiar as to what the gain and MTI/Sea Clutter adjustment do and how they affect each other.
Get the best your wallet can afford but don't be afraid to go with the smaller units. Practice with them and set them up in good weather it will payoff well into the foggy times. Money doesn't always by effectveness user proficiency always does.
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