=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Midway Island       760/001 RLR(1964) is 9.2m below BM21
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Nov-2011
Using information from the NOAA website the RLR diagram has been revised. Primary benchmark remains BM 21 named 21 1959 in the NOAA report 3.343m above gauge datum.