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Jahresbericht Hr. 16/1961 
official routes of the North and Baltic Sea 20 new wreck positions could be 
ascertained and 53 which were already known re-checked, and another 8 pos 
itions searched for underwater obstructions. As in earlier years our sur 
vey and research vessel "GauB" performed a number of research and experi 
mental trips. The survey vessel "Süderoog" as well was put into operation 
for several shorter tests and investigation trips. 
It would have been unrealistic if in the year under review we had made 
plans for a..larger oceanographic research project, though in the field of 
oceanography as well as in geophysics a number of important activities were 
partly continued according to routine and partly newly commenced. To make 
mention of some: measurements by means of paddle wheel current meters in 
the German Bight and Plensburger Fbrde; continuance of hydrographic observ 
ations on 8 light vessels; special hydrographic investigations near the 
Flensburg light vessel; investigations on the mixing processes in the North 
Sea by applying new methods; collection of observation material with regard 
to the question on oil contamination of the North Sea; measurements of the 
displacement of sands; geophysical observations for registration and inter 
pretation of the deeper grounds of the North Sea shelf; geological investig 
ations of the inner German Bight. For fulfilling the task: "the supervision 
of sea water for radioactivity" instruments were bought, partly for the use 
on board and partly for laboratory purposes, calibrated, and tested, and in 
different places of the North and Baltic Sea the first measurements carried 
out with the result that the level of radioactivity does not exceed the nor 
mal. 
The revision of the "Atlas der Gezeitenstrome" for the North Sea, the 
Channel, and the British waters, which was first published in 1957, was 
continued,taking into consideration amongst others the results of paddle 
wheel current measurements gathered by the G.H.I. The atlas is due to appear 
in 1962 as a revised issue. The compilation of terms for a navigational 
dictionary in co-operation with other respective authorities has made pro 
gress. Special emphasis is placed on radar. The problem of whether it is 
possible to use artificial earth satellites for navigation and survey pur 
poses was still dealt with. Corrections were made in tide predictions of 
the storm surge warning service and time service. The tide tables (2 volumes), 
tide calendars of the German Bight (5 numbers) and the nautical yearbook 
were issued in the usual manner. 
In the field of nautical engineering a considerable lack of specialists 
became noticeable, on the account of which deadline projects as well as 
special tasks, the development of methods for testing, and research and test