=========================== 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