IIRC, the Garmin in question has a bayonet mount antenna and you can get an extension cord for it, so that the antenna can be remotely mounted. However, it generally will work inside a fiberglass boat fairly well. I have the older 276 model, which didn't come pre-loaded with the coastal maps and doesn't support the XM WX weather info. It also does terrestrial (car) navigation and comes with City Navigator or some other set of USA maps preloaded IIRC.
They're excellent little units. I got mine primarily for use in my truck, but also carry it aboard as a backup to the main Garmin I have.
As for the price. West Marine had a sale last weekend, so he may have gotten it during the sale.
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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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Still—DON'T READ THAT POST AGAIN.