I have the 620myself, great machine. If you're not going to use it much in the next two years, look for a used better machine.
beamie, Have you been able to mark groundfish? It's the only thing I can't seem to mark. I mark bass,blues,tuna,bait fine and have played with settings till the cows come home to try and mark them. Everyone I talk that fishes for alot of groundfish says you need 1000w machine to mark them.
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