Typically, my exploring friends and I will pool the coordinates of the prospective sites together, and then I'll group a series of coordinates so that they're in the same general area and arranged in a logical sequence to hopefully hit all of them in the shortest possible distance. We'll take a trip out that way at some point using the GPS to get us from one to the next via the fastest route.
Additionally, I bring with me supplimental written descriptions of what I'm looking for once we're in the general vicinity if the tunnel is, for example, out of view behind a building, etc., then I'll make a note of that or give directions that I need to head, say, a little north of the intersection the GPS brought us to. I almost always have my Alphasmart with me (see the Gear page), and that's a good resource for carrying notes like this as well as annotating them with additional details (e.g., "Couldn't find it.") so I can follow up on things later or do a write-up for the journal or gallery page.
While this method
is a good approach, there are a lot of places that turn out to be duds
once we get to them on the ground. Based on previous scouting trips,
only about a third of the places will turn out to be anything interesting,
but these are often places I otherwise never would have happened across
on my own without getting completely lost first, so it's worth the trip
after having exhausted all the obvious spots within driving distance.
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