I wouldn't go with a 376c as a chartplotter, as it doesn't have any detailed charts pre-loaded.
The 478 is probably a much better buy, since it has the coastal US charts pre-loaded. If you sail inland US waters, the 378 is the same as the 478 but with the inland charts preloaded.
However, I would recommend going with either the 440 or 540, which also have the coastal charts pre-loaded, use standard SD memory cards, instead of the proprietary Garmin cards, and have a much larger, albeit lower resolution, screen. They're also less expensive than the 478 model, and probably comparable to the 376C model in price.
If you can swing it, you might even look at the 3205, which has even higher resolution than the other models. The major advantage of the 3205 is that it is capable of upgrading to handle radar as well.
Comparison chart here.
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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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