Review: Microsoft Streets and Trips
Ken in Regina
Actually I can use my eTrex as an external GPS on my computer. But it's an older model, eTrex Legend HCx.

But your question is correct, to ask which Garmin GPS model is being used so we can help figure out whether it even has the ability to provide data output to a computer and, if so, what is the optimal way to do that, and to test that it's functioning the way it should.

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