Hi,
Sometimes you have to deduct and do a little of trial and error. You should be able to deduct the area (Jagdtrapeze)from here:
http://www.gyges.dk/JMN%20stor%20v20.pdf
if you know the approximate position.
In your case the J.T. might be a bit further east i.e. you have to try 24 O and 34 O.
It helps if you have a general idea about where the frontline was located see:
http://www.dean.usma.edu/history/web...ar%20index.htm
which I my opinion is a small researchers goldmine.
bregds
SES