I have the earlier model from that line of GPS units, the 276. AFAIK
, they don't make a 476, but the http://www.garmin.com/products/gpsmap478/
is probably the unit you're talking about.
I like my 276 unit...and it does work quite well on both land and sea. The one thing you do have to remember to do is to switch from sailboat mode to automotive mode when you move the unit from the boat to the car.
I believe the major design change between the 276 and the 378/478 is the addition of the XM weather radio data and the inclusion of the entire chart set for either inland waters on the 378 or coastal waters on the 478, rather than just the Bluechart software allowed by the 276, which has no real detailed charts built-in.
The Garmin data cards are proprietary and I highly recommend that you get at least one, with the USB card reader. This allows you to do firmware, waypoint, route, track and map updates without having to have the unit next to the computer.
It should work fine with the autopilot from Raymarine, as mine is tied into a Raymarine ST1000.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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