Nagappattinam 500/087 RLR(1976) is 9.9m below BM 237
Documentation added 1994-08-04
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.
Documentation added 2002-12-06
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.
Documentation added 2014-05-21
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.
Documentation added 2017-06-27
Name corrected to Nagapattinam to match supplier
Survey of India Geodetic and Research Branch 17 E.C. Road Dehra Dun PIN 248 001