The main difference is the position keeper and that the target angle is not actualized.
In an U-Boat I always get new target data just a few seconds before I fire the torpedo. Because of the missing position keeper the distance is always the same since the last time you are refreshing target data. If everything is correct the PC has the target position even after several minutes(calculating you own speed, too!). The german TDC isn't capable of doing this. Your angle to target/AoB and target speed is calculated. Your own speed and distance NOT. So it's a really good idea to "refresh" all data except target speed a short moment before you shoot. Otherwise you'll fire the torpedo with old/incorrect data!
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