Gary,
It wouldn't have allerted you to your error  unless you'd
had some reason to stop and check, The talking compasses, like the Columbus
have a resolution of 45 degrees or so, so whe they work they can tell you
if you're 90 degrees off course.  I'd try to find an edge to
track or other land marks but if it's really a large unmarked area then a 
compass may be your only resort.

Tom

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