The Deutsches Hydrographisches Institut (PHI) in 1984 
115 
cartographical and technical printing tasks for the production of nauti 
cal charts, nautical books, and other nautical and scientific publica 
tions of the DHI. Amongst other things, a twenty years’ old two-colour 
offset printing machine was replaced by a new model. 
For the protection of the marine environment, the monitoring of the sea 
was continued within national and international programmes. The activity 
concentrations of artificial radio nuclides in the water of the North 
Sea indicated a further gradual decrease. The oxygen supply of the deep 
er water layers of the German Bight this summer was much better than in 
previous years. The analyses for heavy metals and organohalogens in wa 
ter and bottom samples permit no recognition of any negative changes 
compared with the previous years. A concept was compiled as to how the 
biological monitoring could be carried out in the Federal Republic of 
Germany. In connection with the prosecution of pollutions of the waters 
by mineral oil, about 500 samples were analyzed. 
In conjunction with a Space Shuttle Mission and with aircraft remote- 
sensing measurements, the movement of the sea was measured in the North 
Sea for the testing of oil identification and monitoring methods. In or 
der to investigate the influence of fronts upon the mixing processes be 
tween inflows and the open North Sea, a rhodamine experiment took place 
in the German Bight. 
On the light vessel replacement system "GroBtonne Fehmarnbelt", an auto 
matic measurement station was experimentally set into operation. To 
gether with the data buoy NSB tl which, after thorough overhaul and re 
fit has been anchored again near the White Bank in the North Sea, imme 
diate data - amongst other things - for the monitoring of the marine en 
vironment are to be gained from them. 
Under the leadership of the DHI, a fundamental report was presented from 
the international working group "Giitezustand der Nordsee" (Quality Sta 
tus of the North Sea) for the International Conference on the Protection 
of the North Sea. 
The tests of nautical systems, equipment, and instruments, the supervi 
sion of the compliance with the Ship Safety Regulations by controls car 
ried out on board, and the recognition and supervision of firms for the 
testing of nautical systems, equipment, and instruments were carried out 
in the normal way, the authorization of suitable persons as auxiliary 
bodies for the DHI also appertained thereto. 
For the prosecution of offences against the Ship Safety Regulations, a 
great number of proceedings concerning legal infringements and adminis 
trative proceedings for writs of execution were professionally prepared. 
The investigations, undertaken during the past two years, concerning the 
electromagnetic compatibility (EMC), revealed that almost all the test 
objects - inasmuch as the manufacturers had not already applied EMC mea 
sures - exceed the limiting values for conducted spurious emissions, and 
frequently are themselves susceptible to those types of interferences. 
In all the cases investigated, simple measures - such as changing the 
ground point, shielding of the mains or installation of mains filters - 
are sufficient in order to keep within the EMC limiting values. The 
equipment for the testing of the behaviour of nautical systems and