=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Digby NS            970/005 RLR(1969) is 16.1m below BM 921G
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993
Digby NS            970/005 RLR(1969) is 16.1m below BM 921G
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 04-Apr-2012
Last data recived from Digby was that for 1970.