Map of West Berlin, published in the DDR . Cold war.

Not terribly useful for tourists. Mildly out of date. But quite delightful all the same. Taken from the volume West Berlin - THE FACTS.
I don''t think the UK Ordnance survey has a specific symbol for a Revanchist and Militarist Organisation. Or indeed for a secret service and subversive organisation, though of course they do exist and are unmarked....