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Old 03-20-2009
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I'd recommend something more like the Garmin 478 unit. The problem with the 640 is that it is really designed to be permanently mounted. The Garmin 478, which looks like this:


is designed to be portable, and can actually operate without being plugged in for about 12 hours due to having an integrated rechargable battery. You can buy a bean bag mount for it as well. I have the older 276 Plus unit. The 478 comes with the US Coastal charts preloaded and can use the Bluechart charts for areas outside of the US coastal waters.

The screen is a bit smaller, but for what you're doing, this is the only unit that really makes sense. It also can be used in a car for automotive navigation as well...so it really is a decent dual purpose unit.
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Telstar 28
New England

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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