=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 22-Feb-1999
Gauge is a Russian type, CYM Honngu is an historic station last data 2001
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Nov-2015
Monthly mean sea leve data values for Hon Ngu 2001-2013 have been supplied by the Institute of Meteorology, Hydrology and Climate Change (IMHEN) Viet nam.