East London 430/090 RLR(1967) is 11.2m below BM'TG Pit'
Documentation added 1996-08-28
For discussions of MSL changes and extreme sea levels around Namibia and South Africa, see: G.B.Brundrit, S.Afr.J.Mar.Sci.,16,9-17,1995 and S.Searson and G.B.Brundrit, S.Afr.J.of Science, 91,579-588,1995.
Documentation added 2009-09-24
Heights of chart datum relative to land levelling datum in South Africa and Namibia: East London Datum: up to 31st Dec 1978 = -0.762 Datum: 1st Jan 1979 - 31st Dec 1997 = -0.900 Datum: 1st Jan 1998 - 31st Dec 2002 = -1.006 Datum: 1st Jan 2003 onwards = -0.716 Datum is now LAT so unlikely to change.
Documentation added 2010-05-11
There appears to be a spike in the dataset for November 2002. This is possibly real as it appears in several of the S. African stations.
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