=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Mar-1994 data up to 1991 revised, March 1994 =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 15-Jul-1994 Port Renfrew 822/106 RLR(1987) is 10.0m below BM 1,1957 =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 20-Apr-2000 Port Renfrew discontinued 1997