I use Google Maps a lot, but all my playing at the moment is online (RPOL) so it is easiest that way...
If I were to GM face-to-face now, I would also use Google Maps as my 'plan' for an area. It obviously shows the 'real world' at a point in time, and is nicer than anything I can come up with on my own from a blank page. If I do it all myself, I always forget things (hedgelines, trees, random buildings, etc.).
I do the same when I am doing tabletop wargaming too, for the same reasons.
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