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I had a magellan back a while ago. Not too accurate and not top of the line. I was going to use it for boating but that never turned out so I sold it.
GPS has come a long way. From what I hear, Military clearances have been lifted on GPS and it's been getting pretty accurate, like, within 10 feet I think it is. I was shooting the bull with a man I helped dock up a 30 foot trawler and he was saying he can tell where he is within a matter of feet. I've never used this brand but Garmin seems to be the top name in GPS systems right now.
Your best bet would be to take a little trip down to West Marine or a boatshop that you're comfortable with and have them explain a system. Some of these buggers are quite intricate with them being able to hook up to Chartplotters, Laptops, Loran systems and god knows what else.
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