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@aggi
I have a Casio Protrek http://www.creationwatches.com/products/casio-protrek-58/casio-protrek-triple-sensor-atomic-prw-3000-1d-prw-3000-1-4147.html
Seems OK but I've never used it for anything that accurate that +/- 10 degrees would make a difference. May have a try at some point compared to a proper compass or a Garmin.