How to reach:
To reach the tidal bench marks from Chignik via boat, proceed NNE out of Anchorage Bay 6.0 km (3.2 nm), then ESE 15 km (8 nm) to Jack Point, then WSW 15 km (8 nm) along the north shore of Castle Bay to the head of the NW Arm and a small curve of flat land which projects south from the mainland. Four of the bench marks are located east of the point along a rock cliff shore. The remaining bench marks are on the flat land, inland from the shore. The tide station was located at the top of the stone beach, just east of where the beach curves to the south.