Tile German Hydrographic Institute within the year 1964 
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strongly supported the experiments with Hi-fix systems. '14 type tests were 
carried out in the year under review and, in addition, informatory courses 
held on the survey of D/F sets on hoard. 
In .the fields of Geophysics and Astronomy a radar photoplot was 
thoroughly studied during cruises into the Atlantic, and the Baltic: those 
interested in shipping circles took the opportunity to inspect the unit 
with a view to preventing collisions. On the occasion of the 12th General 
Assembly of the International Astronomical Union, about 70 participants 
visited our Time and Latitude Service. The PZT could again be technically 
improved. The results of latitude and time fixing have, as always, been 
transmitted or exchanged on an international basis. In this year under 
review, SOT "Gauss" performed the last of eight partial cruises serving 
the geophysical and tectonic investigation of the Berth Sea subbottom 
structure. The department "Geophysics and Astronomy" participated with 
measuring the total intensity of the earth's magnetic field and with 
gravimetric measurements. The evaluation of the data obtained, the gravity 
anomalies in particular, was completed and the results represented in an 
isanomalles chart. More than 100 programmes are now available for the 
electronic computer IBM 1620. For less complicated computational work a 
three-signs code was developed so that the leaders of the single sections 
can draw up smaller programmes themselves. 
Five smaller cruises into the Hoith and Baltic Seas served oceanographic 
investigations. They covered radiological and hydrographic measurements in 
the mouth of the river Elbe, the taking of bottom samples in the German 
Bight, and investigations of the mixing processes in the northern Baltic. 
The Khodamin B experiments axe now completed and the results published. 
On account of this publication it was decided at the ICES meeting in Copen 
hagen to carry out a large-scale test in the next few years, with several 
vessels of different Borth Sea states. Preparations have already been made. 
The continuous current measurements started in 1963 off the mouth of the 
river Eider are now completed and thus the observations of almost 400 days 
available. The drift current investigations, too, started in autumn 1962 
with about 5,000 drift cards have been finished. Bow that the drift of 
about 65 per cent, of the cards liberated into the sea was again analysed, 
the preliminary result is confirmed according to which the velocity of the 
drift current is 4.2 per cent, the velocity of the wind. The investigations 
of the behaviour of the therxnocline in the Borth Sea, too, could be 
completed by the edition of an atlas. The continuous measurement of the 
tracer amount dissolved in sea water proved successful. Several judgements 
on the possibility of depositing industrial wastes in the sea were given. 
The geological work at sea and in the laboratories centred on systematically