If you use the coordinates in the Waymark listing (N 42° 53.001 W 074° 12.685) it is really 6.42 miles.
Looks like Mr. Snat either mistyped coords or mislabeled the town/state.
Edit: Looking at a few maps I'm going to assume Mr. Snat entered the coordinates incorrectly. Perhaps N 42° 53.001 W 073° 12.685 would be better. (You still da man, though)