How to reach:
To reach the tidal datum from Wrangell, AK, proceed via boat north in Zimovia Strait towards Stikine River for 4 KM (2 NM) to the entrance to Eastern Passage. Then turn and proceed SSE in Eastern Passage for 22 KM (11 NM) until reaching Channel Island. Then turn north into Madan Bay and proceed 3 KM (1.3 NM) from the mouth of the bay. The tidal bench marks and the tide gauge were located on the west shore of Madan Bay at approximate position latitude 56 degrees 23.54' North, and longitude 132 degrees 10.14' West.