GLOSS Station Handbook

Station information sheet

GLOSS number297
Station name


Time zone045E, GMT + 3hrs
Latitude (+ve N)-6.15
Longitude (+ve E)39.18333
Observation period(s)1950s Munro, 1984-
Responsible countryTanzania
Authority responsible
for tide gauge
Zanzibar Department of Surveys and Urban Planning, Commission of Lands and Environment, P.O. Box 811, Zanzibar, Tanzania
GLOSS contactTanzania
Committed to GLOSSYes
Location mapView location map for GLOSS station Zanzibar   View location map for GLOSS station Zanzibar
Digital dataYes
Data acquisition rateRecording at 10 minute intervals, filtered to hourly heights.
Fast delivery data at UHSLCDownload h151.dat from UHSLC   Format documentation for UHSLC data
High frequency data at BODCDownload from BODC   View Zanzibar site history   View BODC document #42146  
High frequency data at UHSLCDownload from UHSLC   Download documentation qa151a.dmt from UHSLC   Format documentation for UHSLC data
Real-time data availableYes
Real-time data transmitted
to GLOSS Fast Centre
Real-time data plots from UHSLC
Tide gauge benchmarksOld TGBM - about 30.0m from tide gauge (521209E, 9319992N)
Benchmark relationshipsBMI at Malindi roundabout = 3.80m above Land Survey Datum (1984, 1987) Mean Sea Level is 2.08m above Chart Datum
Auxiliary benchmarksTGBM 1 is 3.709m above LSD TGBM 2 is 3.750m above LSD TGBM 3 is 3.925m above LSD
Data at PSMSL 
Annual MSL (RLR) dataDownload annual MSL (RLR) data for Zanzibar
Annual MSL (RLR) plotView annual MSL (RLR) plot for Zanzibar
MSL methodaverage of daily values
PSMSL code1600
Other relevant codesUHSLC 151
Additional information 
Other relevant informationGauge re-located in Zanzibar Harbour during 1990. Daily values calculated using 119-point convolution filter (Bloomfield, 1976) centred on noon applied to the hourly data with respective periods of the 95, 50 and 5% amplitude points at 124.0, 60.2 and 40.2 hours.
Last updated1992-09-26

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)