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Old 12-17-2010, 10:13 AM   #15
Steve W
Old Grouch
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Joined: Apr 2008
Location: Rocky Mountains of Alberta
Oddometer: 663
Originally Posted by willcasp View Post
The 478 was a marine unit. The 640 is the replacement for it, and for marine functionality, it is pretty much a feature match.
Not so for on road use though. IIRC the feature set is reduced quite a bit once you're out of marine mode. I think there's a track feature or two missing as well. The whole line from the 276C and it's predecessors on were chartplotters or marine units.

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