This is the main admission entrance to parking at
the west end of the Gaithersburg Fairgrounds on
Perry Parkway
Lat N 39°08'48.3" Lon W077°12'50.2"
Mary and Dan wanted this but, in case some of you
want to add the waypoint to your GPSes or give it
out in advance, I posted it here. (DOP zero (!),
error 4m, wgs84).