More expensive, but might be more useful
I do a lot of hiking and biking and when I'm in a new area, I use my Garmin GPS to map the trails that I'm on. The cool part to this is that you can track how far you've gone, view a map of your path, then download it to your computer.
Garmin GPS's also have a backtrack feature to them that will guide you along the same route you took, not just the direction back to where you started. This is especially handy when hiking because its generally frowned upon to make your own trails.
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