The U-13 has returned to port to assist a Kriegsmarine research project into optics. The aim is to understand distortions present in the "cameras" used at various stations. The immediate goal will be accurate altitude measurement of stars for celestial navigation, but there might be implications for Weapons Officers as well as these distortions could affect measuring accurate bearings and range.
There are two distortions present in the SH3 cameras which must be accounted for if we are to measure the altitude above the horizon of a heavenly body. The first is well known and encountered frequently in the game. This picture shows it well.
Even though the horizon displays as a flat line, the altitude to the sun or star appears to increase as bearing changes from the correct azimuth. Obviously we must center the object if we are to measure the altitude consistently and perhaps accurately.