North is up. We came upon the cat ketch already aground at R-62A. He was right on the magenta line about half way between us and the mark. Two futile attempts to feel our way through led to bottom. The track around east of the mark and over what appears to be marsh had a minimum of 5.5 ft at one hour before low tide. See Lynn's comment below and leave R-60 well to the west also. Gee, as marked. Why didn't I think of that? Skipper Bob's notes this spot, but I missed it as did the others. After we cleared through, we came back to the Brickhill anchorage (to the NE) to kibbitz with the grounders. We collectively scratched our heads, pushed a little and pulled a little to no avail so they waited to float off. No damage, no blood on the decks, met some great folks. Just another day on the Ditch.