Well to start you get knob controls on the Furuno. Menu's to jump thru on the Garmin.
I run my Furuno 582 in manual mode only. I can teach anyone to operate it in 2min of instruction. That's not going to happen with jumping thru menu's.
The 620 w/ Airmar B-60 is a real nice combination.
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"Just 'cause it's new, doesn't mean it's worth a Damn."