Please note: In many cases, the station position in our database is accurate
to only one minute. Thus, the tide gauge may not appear to be on the coast.
Nearby GNSS Stations from SONEL: SIMO
Fast Delivery Data from UHSLC station 221: hourly and daily
Research Quality Data from UHSLC station 221: hourly and daily
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. 1957 - 1972 VALUES BASED ON 8 READINGS PER DAY
Documentation added 2000-06-14
Data for Jan-April 1990 removed as suspect.
Documentation added 2009-09-24
Heights of chart datum relative to land levelling datum LLD(MSL)in South Africa and Namibia: Simons Town (Bay) Datum: 1st Jan 1973 - 31st Dec 1978 = -0.651 Datum: 1st Jan 1979 - 31st Dec 1997 = -0.900 Datum: 1st Jan 1998 - 31st Dec 2002 = -1.003 Datum: 1st Jan 2003 onwards = -0.843 Datum is now LAT so unlikely to change.
Documentation added 2019-10-23
The South African Navy Hydrographic Office (SANHO) are the copyright owners of the Simons Bay sea level data and must be contacted to request permission to use the data.
Data Authority
Hydrographic Office Maritime Headquarters Private Bag X1 Tokai 7966