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The German Hydrographie Institute within the year 1963 
corrections of the time signals have been published since the beginning of 
that year with an accuracy of 0.001 seconds, nowadays reached by the group 
of the most outstanding international time service institutes. The geomagnetic, 
gravimetric, and seismic investigations of the North Sea sub-bottom structure 
were continued in co-operation with the Bundesanstalt für Bodenforschung. 
Besides SRV "GauB" and four cutters, a helicopter participated for the first 
time in the refraction seismic measurements. Gravimetric instruments were 
further developed and a disturbance chart constructed-for the south-eastern 
North Sea after our own measurements. The electronic computer IBM 1620 has 
excellently stood its test. l'or the most important tasks more than 40 tested 
programmes are now.available. The major tasks covered the analysis and the 
computation of the tides for the German North Sea ports, the computation of 
hourly water levels for Cuxhaven, the computation of the ephemerides for the 
Nautical Yearbook, the computation of the I0RAN hyperbolae for the area be 
tween Greenland and Iceland, the computation of the hyperbolae for the North 
British, English, and North Scottish DECCA chains in the North Sea area. The 
Deeca-Hi-Bix systems were tested by the Head of the department Surveying in 
co-operation with the representatives of the federal authorities concerned 
for admission in coastal surveying. The funds allotted by the Volkswagen ✓ 
Werk made it possible to purchase an automatic photoplot and radar unit. 
The oceanographic work mainly covered the area of the North and Baltic 
Seas. SRV "GauB" performed three.research cruises: from the end of May until 
the end of July bottom samples were taken off the coast of East Friesland 
for geologic mapping purposes, with small distances between the stations. 
In September the depth and intensity of the thermoclines were measured in 
the central and northern Baltic and the influence of the autumnly cooling 
on the dissolution of the layers investigated; this purpose served the tow 
ing gear "Delphin" continuously recording the temperature and the pressure. 
In October the colour tests were continued to study the mixing processes. 
In co-operation with the Wasser- und Schifiahrtsdirektion Kiel and the Nas 
ser- und Schiffahrtsamt Tonning a continuous current measurement was started 
off the mouth of the river Eider; the stations shall be-maintained for one 
year; besides this, current observations of a 15 days’ duration each were 
supplied from seven stations in the north-eastern North Sea. Hydrographic 
data were collected by the members of the GHI in eight German ports and by 
voluntary assistants in overseas ports. The publication on the thermocline 
of the North Sea is in print. The number of fixed stations recording the 
motion of the sea near the coast was increased and instruments were developed 
to register the sea during storm surges immediately in front of the dike and 
the wave run-up on the dikes. The electronics of the towing gear "Delphin" 
were improved and a tape recorder registration developed. Two new salino- 
meters were tested and the salinity of almost 10,000 water samples determined.