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I use the GPS72 I got about 5 years ago. Its pretty basic. No maps. I use it to store my numbers and navigate back to known spots. It has a decent sized antenna and sensitive receiver and sees lots of satellites at a time. My first GPS was an off-brand. It kept losing lock because the antenna was small and the receiver wasn't very good. I would stick to the big brand names.
Even thought these things are "waterproof", over time, water has seeped into the battery compartment. I've had to fix it a couple of times but I'll probably need to replace it this year. But it did run for a few years so I'm not complaining.
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