=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Magueyes Island     938/011 RLR(1964) is 10.6m below BM1
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 24-Nov-2011
Using information from the NOAA website the RLR diagram has been revised. Primary benchmark remains BM 1 but given the full title TIDAL BM NO 1 CAMA UPR 1955 ELEV 4.755m above gauge datum.