The south endpoint, within Fort Dix (now part of a "joint base" with other military facilities), needs a label correction. Fort Dix Rd. was rerouted north of the Fort Dix main gate, and no longer enters the base, so the current FortDixRd label doesn't work. Suggest a rename to GenCir, PemWriRd, or some other road intersecting the circle.
I would like a waypoint for the new intersection of NJ 68 and Fort Dix Rd. (also CR 616, and both are signed at the intersection -- I suggest CR616 as the new waypoint name, so FortDixRd can remain a hidden alt label for the current south endpoint). That is shown in OSM. It is the last chance for travelers to leave NJ 68 before entering the main Fort Dix gate, except a turnoff to the visitor center next to and outside the gate. It also is where I had to turn off NJ 68, since my spur-of-the-moment request for a temporary pass to enter the base was denied (basically, I needed both a reason to visit the base and someone to sponsor my entry -- I've had an easier time with some other Army bases).
There is a milemarker 0.5, north of the relocated Fort Dix Rd., and the main gate. It is only about 0.3 mile north of Fort Dix Rd., so that isn't the south endpoint. Mile 0 might be at or just past the main gate, and could be at General Circle (about 0.25 mile south of Fort Dix Rd.) where we have the south endpoint. There also is no END sign before the main gate (don't know what signage is past the gate -- GMSV imagery stops just a few feet past the gate). I suggest leaving the south endpoint where it is.