=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 02-Nov-1993
Possible datum shift after 1957
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Mar-1994
Data up to 1989 revised, March 1994
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 15-Jul-1994
Harrington Harbour  970/101 RLR(1978) is 9.2m below BM HS-5
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 20-Oct-2016
Using revised information from the Fisheries and Oceans Canada the RLR diagram has been updated. Primary benchmark has been renamed and is now 5-1939 height remains the same at 3.257m datum name has changed to Chart Datum.