I was an early user of GPS, as it is extremely handy in field archaeology, particularly in locating archaeological sites quickly and unambiguously. During the preceding decades I had used map, compass, and aerial photographs for that purpose.

The unambiguity of GPS is a real plus, especially after Selective Availability was disabled, but even then the signal can be a little off if you are in a deep canyon, etc. It is worthwhile but GPS should not be relied upon exclusively. My understanding is that paper maps still contain more detail than most electronic versions - and they don't require batteries.