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24. Jahresbericht des Deutschen Hydrographischen Instituts 1969
northwest of Heligoland, the GHl has been studying the effects of these disposals
during measuring cruises carried out regularly.
From June to August, at 14 measuring stations west of Sylt, the seaway was
measured under British, Dutch and American participation with the objective to
gain a closer insight into the generation and the dissipation of sea waves.
By request of the Federal Ministry of Education and Science, the GHI, in cooper
ation with industry, carried out a study on “Systems of automated measuring
instruments at sea with telemetering of data“.
For the current determination of time and latitude, 1952 transits of fixed stars
were observed during 86 nights with the photographic zenith telescope of the
GHI. The electronic installations of the time service were improved: Since 1 March,
all time signals of the GHI indicate, with an accuracy of 0.1 milliseconds, the UTC
(Universal Time Coordinated) of the Bureau International de l’Heure.
The Wind Effect and Storm Surge Warning Service issued — apart from the
routine forecasts - 27 storm surge warnings and 9 navigational warnings on
extremely low water levels. The Ice Warning Service promulgated 141 Ice Reports
and 52 Ice Charts. The Nautical Warning Service transmitted by wireless 1980
informations to mariners. In the year under review, the Hamburg test office and
the agencies of the GHI in other ports tested 63 480 nautical devices and
instruments.
A commission set up in November by the International Hydrographic
Organisation, in which the GHI is represented, finished the preliminary work
for the publication of an international set of charts at scales smaller than 1 in
1 Million. The GHI, too, has taken over the responsibility for processing a number
of charts.
As to nautical books and publications (Sailing Directions, Lists of Lights, List of
Radio Signals, Notices to Mariners, Tide Tables and Calendars, Tidal Current
Atlases, the Nautical Almanac a. o.) 693 980 copies were delivered, apart from
220 233 copies of charts. The annual volume 100 of the “Nachrichten fur See-
fahrer" was issued.
