=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Pointe du Chene     970/036 RLR(1978) is 10.3m below BM HS 1940
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993
Pointe du Chene     970/036 RLR(1978) is 10.3m below BM HS 1940
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 02-Nov-1993
Since 1980 monthly means received from Canadian authority are in cm.