=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Feb-2001
Lahat Datu          665/053 RLR(1997) is 10.0m below BM LDU 1
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Sep-2012
Publication Tidal Observation Records 2010 confirms the Primary benchmark
remains BM LDU 1 5.734m above TGZ.