=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Salgrund            060/081 RLR(1928) is 9.5m below Bolt in Rock
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 24-Sep-2002
A description of the sea level network in Finland can be found in 'Operational Oceanography: Implementation at the European and Regional scales.  2002 (pp.129-137)'.