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29./30, Jahresbericht des Deutschen Hydrographischen Instituts 1974/75 
ing and stratification on marine-chemical and marine-biological processes. Later 
in the year the geoscientific studies on the West African continental shelf were 
continued. The Integrated Navigation and Data Acquisition System, INDAS, 
financed by the DFG, became operational. 
The Deutsches Ozeanographisches Datenzentrum (DOD) 
continued the processing of data from German research vessels and from obser 
vations made on board German lightvessels. As agreed, the processing and the 
exchange of oceanographic GATE data were included in the 1974 activities. 
Early in 1975 the DOD, in cooperation with the Seewetteramt Hamburg of the 
Deutscher Wetterdienst, started to collect and process oil pollution observations 
received from ships (IGÖSS Marine Pollution Monitoring Pilot Project). 
The DHL intensified its activities of monitoring the sea for noxious 
substances: water and sediment samples are presently taken once a year 
at 23 positions in the German Bight and at 18 positions in the western Baltic. 
They are examined for their content of heavy metals and chlorinated hydrocar 
bons, North Sea sediments were particularly examined for deposits of suspended 
matter from the rivers. As in previous years the effects of discharged waste 
from the titane dioxide production were monitored. 
In addition to its activities as monitoring authority, the DHI has been entrusted 
with the functions of an authority for the issue of permits for the dumping of 
wastes in the open sea. The treatment of the relevant applications is carried out 
in accordance with the guidelines of the international Conventions for the Pre 
vention of Marine Pollution (Oslo and London, 1972). 
In connection with the exploration and exploitation of natural resources on the 
German continental shelf, 58 applications, inter alia for seismic mea 
surements, bottom sampling and gravel exploration, were approved by the DHI; 
furthermore, licences for 11 exploratory drillings were granted. 
The studies of the generation of sea waves were successfully continued within 
the scope of the international major experiment JOMSWAP (Joint North Sea 
Wave Project). A method of predicting sea waves in the North Sea and the 
Baltic is being developed. 
Further scientific and nautical-technical research activities which are of im 
portance for shipping and fishery, as well as the scientific services, 
of the DHI (tide and water level prediction service, storm surge warning ser 
vice; ice service; time and latitude service; geomagnetic service; nautical instru 
ments testing service) were carried out as in previous years. 
Apart from the daily water level predictions 29 storm surge warnings were 
issued in 1974 and 19 in 1975. In the winter of 1974/75, with relatively little ice 
occurring in the North Sea and the Baltic, 106 ice reports and 35 ice charts were 
published. 
After type tests 166 new or improved nautical instruments and devices of ship's 
equipment were accepted for installation in German vessels. Almost 36 400 
individual tests were carried out in Hamburg and by the DHI agencies in other 
ports. Besides, more than 4 000 tests of shipborne radio navigational equipment 
and retests were done. The DHI agencies at Lübeck, Duisburg-Ruhrort and Cux 
haven had to be dissolved for reasons of rationalising. The testing service in 
these ports is now undertaken by private firms on behalf of the DHL