Ahoy
and wellcome back to SH2 :|\
what you need to do is open with windows notepad the file called "Sim.ini" located at "Silent Hunter II\Sim" folder, and add this (You can copy & paste):
[DEBUG]
FullCameraElevation = TRUE
Remember that the ini file is also useful to detune the sonar in game (Enemy and also yours) if you add this lines:
[SONAR]
Sensitivity = 0.8
You can set any value between 0.0 (No sonar sensitivity) and 1.0 (Normal sonar)
Good hunting