I can see some use for GPS... especially if you document the heck out of your jobs. You can plot the locations of lines and boxes that just might be hard to find after the parking lot is paved...
Out here in Nevada, I have received "addresses" that read 'Take I-80 to exit 245, then drive 70 milen NNE' - and the pavement ends right at the exit! GPS might be a real aid for the mining / ranching districts out here.
BUT- Neither maps nor GPS are a substitute for an awake mind. "100 feet ahead" from the GPS just might leave out details like the 50 ft. cliff just in front of you! Nor will it tell you that the route it's chosen just might be flooded, shut for repairs, or be too soft for travel.
