MSL has various meanings in the Ordnance Survey category. Discover the full forms, definitions, and usage contexts of MSL in Ordnance Survey.
Level that sea would maintain if no tidal effect were manifested and average meteorological conditions prevailed for hydrographic and surveying purposes the level is derived from very prolonged and careful observations at an appropriate position Newlyn, Cornwall, being selected for British standard level
Ordnance SurveyLast updated: