I'm looking at these two units for my father's boat. All his fishing is within ten miles of the coast and 95% of the time along the beach looking for stripers, blues and weakfish. I know the sounder on the furuno works great but the screen isn't as nice as the garmin. I like the garmin plotter and screen alot better but don't know how well the GSD20 blackbox sounder performs. Is anybody using the GSD20 and if so how is it performing? Do you think it will get the job done? My father is just a casual fisherman so the sounder doesn't have to be as good as the furuno, but I don't want to waste his money on something that doesn't work.
Thanks John