Just remember to match your datum on your map to the one your GPS is using. There is a large discrepancy between WGS84 (which is the default on my last two garmins) and say NAD27 or Tokyo or whatever your map has in the marginal data.

Garrett
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On occasion of every accident that befalls you, remember to turn to yourself and inquire what power you have for turning it to use. - Epictetus