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I ponied up my $4 for EveryTrail Pro -- works mostly as billed, though I did have one tracking freeze where it wouldn't resume tracking till after I rebooted my iPhone. My biggest gripe is with the iPhone camera, which seems to enjoy underexposing everything. By the way if you're a Tanglewood fan: trails are very muddy today.
Mind the traffic if you're out on the road -- drivers are generally courteous but it only takes one to ruin your day.