I revisited NJNYPA on July 4. I had always wondered about the apparent
discrepancy between the placement of "tri-state rock" on bedrock at the tip of the
peninsula and the positioning on the topo, which shows the point out in the
river. I used topozone to
identify (NAD 27) coordinates for the point in the river and the tip of the
peninsula.

Trifinium:
http://topozone.com/map.asp?z=18&n=4578239&e=525470&s=25&size=s&u=1&layer=DRG25

Tip of Peninsula:
http://topozone.com/map.asp?z=18&n=4578244&e=525506&s=25&size=s&u=1&layer=DRG25

Standing atop tri-state rock, GPS placed the trifinium some 100 feet further
south into the river, fortunately accessible this day because the river was
low and two sand bars extended south from the tip of the peninsula. Once I
walked out to the farthest sand bar, GPS said I was about 40 feet from the
trifinium, which is about as close as my Garmin Summit unit ever gets to pre-entered
waypoints before it starts
"wandering."

These results seem to bear out the position of the trifinium as being out in
the river, as shown on the map, rather than at tri-state rock. If this has
already been beat to death, my apologies, but does anyone have any answers to
this apparent discrepancy?

Mike Schwartz