=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Nagappattinam       500/087 RLR(1976) is 9.9m below BM 237
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 04-Aug-1994
For a discussion of interannual variability of sea level along the coasts of Pakistan and India, see Clarke and Liu, Journal of Physical Oceanography, 24, 1224, 1994.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 06-Dec-2002
SMRC Newsletter Jul-Dec 2001 reports high E coast correlation with SOI and MSL. MSL is much higher during La Nina tropical cyclones than during El Nino.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-May-2014
2009 data has been supplied by Survey of India. Previous data 1989. From the data sheets the data still refer to Chart Datum but benchmark has changed. RLR diagram revised with new benchmark details. 2009 data looks good.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 27-Jun-2017
Name corrected to Nagapattinam to match supplier

