Thanks to several correspondents
the problem has been solved regarding the strange structures at the Spuikom
the Bredene.
Peter Van Onsem was kind enough
to send me a post war picture of the crane for servicing German WWII hydroplanes.
During 1947 - 1948 the crane
was demolished by contractor Versluys from Bredene. Only 4 socles
remain.
During liberation days the Germans
tried to destroy the crane but they weren't very successfull.
Updated February 18, 2006, July 19 2009
NGI chart: The structures can be found near the the dot with 'Location'.
Peter Van Onsem send me this picture.