Tanzania (Zanzibar) Station information sheet

GLOSS number 297
Station name


Country Tanzania
Time zone 045E, GMT + 3hrs
Latitude (+ve N) -6.15
Longitude (+ve E) 39.18333
Ocean Indian
Observation period(s) 1984-
Responsible country Tanzania
Authority responsible
for tide gauge
Commission of Lands and Environment, P.O. Box 811, Zanzibar, Tanzania
GLOSS contact Institute of Marine Sciences
University of Dar-es-Salaam
P.O. Box 668
Committed to GLOSS Yes
Operational Yes
Location map View location map for GLOSS station Zanzibar   View location map for GLOSS station Zanzibar
Float Yes
Pressure No
Bubbler No
Acoustic No
Radar No
Digital data Yes
Data acquisition rate Recording at 10 minute intervals, filtered to hourly heights.
Fast delivery data at UHSLC Download h151.dat from UHSLC   Format documentation for UHSLC data
High frequency data at BODC    Download document g297.txt  from BODC   
High frequency data at UHSLC Download from UHSLC   Download documentation qa151a.dmt from UHSLC   Format documentation for UHSLC data
Real-time data available Yes
Real-time data transmitted
to GLOSS Fast Centre
Real-time data plots from UHSLC
Tide gauge benchmarks Old TGBM - about 30.0m from tide gauge (521209E, 9319992N)
Benchmark relationships BMI at Malindi roundabout = 3.80m above Land Survey Datum (1984, 1987) Mean Sea Level is 2.08m above Chart Datum
Auxiliary benchmarks TGBM 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) data Download annual MSL (RLR) data for Zanzibar
Annual MSL (RLR) plot View annual MSL (RLR) plot for Zanzibar
MSL method average of daily values
PSMSL code 460/016
Other relevant codes UHSLC 151
Additional information  
Other relevant information Gauge 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 updated 1992-09-26