=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991 Wake Island 720/021 RLR(1972) is 9.8m below BM12 =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 24-Nov-2011 Using information from the NOAA website the RLR diagram has been revised. Primary benchmark remains NO 12 1961 4.353m above gauge datum.