GLOSS Station Handbook

Station information sheet

GLOSS number268
Station name


CountrySouth Africa
Time zone030E, GMT + 2hrs
Latitude (+ve N)-34.18333
Longitude (+ve E)18.43333
Observation period(s)1957-
Responsible countrySouth Africa
Authority responsible
for tide gauge
Hydrographer, South African Navy, Private Bag X1, Tokai 7966, South Africa
GLOSS contactSouth_Africa
Committed to GLOSSYes
Digital dataYes
Additional parametersSea temperature (from 1990), air pressure (from 1990)
Data acquisition rateFloat/stilling well - digitized hourly. Acoustic meaned values recorded at one minute intervals.
Fast delivery data at UHSLCDownload h221.dat from UHSLC   Format documentation for UHSLC data
High frequency data at BODCDownload from BODC   View Simonstown site history  
High frequency data at UHSLCDownload from UHSLC   Download documentation qa221a.dmt from UHSLC   Format documentation for UHSLC data
Data held at national organisationYes
Real-time data availableNo
Additional parameters (real-time)Sea temperature (from 1990), air pressure (from 1990)
Tide gauge benchmarksTrig Survey BM 28 G. UTM Grid Reference 34 HBT 641144.
Benchmark relationshipsTide Gauge Zero (TGZ) = South Africa Chart Datum TGZ = 0.651m below LLD (MSL) until 31 December 1978 TGZ = 0.900m below LLD (MSL) from 01 January 1979 TGZ = 3.663m below BM 28 G
Data at PSMSL 
Annual MSL (RLR) dataDownload annual MSL (RLR) data for Simonstown
Annual MSL (RLR) plotView annual MSL (RLR) plot for Simonstown
MSL methodDoodson X0 filter
PSMSL code826
Other relevant codesUHSLC 221
Additional information 
Other relevant informationValues based on GPS have been observed but not finally calculated.
Nearest Met. stationCape Town
Last updated2002-12-11

Related BODC pages

Sea level portal      World Ocean Circulation Experiment (WOCE) — Sea  level
UK Tide Gauge Network     Climate Variability and Predictability (CLIVAR)
GLOSS project page  


Related external links

Global Sea Level Observing System (GLOSS)     Permanent Service for Mean Sea Level (PSMSL)
University of Hawai`i Sea Level Centre (UHSLC)  World Ocean Circulation Experiment (WOCE)


Permanent Service for Mean Sea Level (PSMSL) Global Sea Level Observing System (GLOSS) Station Handbook Intergovernmental Oceanographic Commission (IOC)