Found that cache today, the one with the waypoint 223 feet away at a bearing of 171 degrees magnetic. It was out of sight on a high ledge, an old film canister stuck magnetically to the underside of a historic bridge by the river. That was an undertaking, but I am sadly unable to give up on a challenge even when I probably should. For good measure, I then went looking for the only other cache I hadn't been able to find, and eventually located it masquerading as a screw under a park bench. I must be insane.