You can also superimpose routes and tracks onto it from the GPS. Here's a short track I made while walking the dog the other day. You will note there is a significant deviation on the South end of the path...I did not walk through anyone's yard or house, but it does demonstrate both the amazing accuracy, and the amount of error possible in the technology.
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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