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Old 12-17-2010, 10:07 AM   #14
willcasp
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Joined: Jun 2005
Location: Bothell, WA
Oddometer: 122
The 478 was a marine unit. The 640 is the replacement for it, and for marine functionality, it is pretty much a feature match.

I would be satisfied with a 640 that supported XM WX in road mode. I would think that this would not be too hard for Garmin to turn up with a BIOS update.

They are already selling the 640 to their target marine market. This would increase sales of an existing product, while satistying the market at the same time.
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