=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Pulau Langkawi      550/002 RLR(1986) is 10.3m below BM K0173
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Sep-2012
From the Malaysian publication Tidal Observation Records 2010 the Primary benchmark at Pulau Langkawi is now BM K0172 5.545m above gauge datum.