[Hitman]

Regarding range estimation via TBT, the real subs didn't have any because the TBT was just intended to be a bearing line transmitter. What happens is that early in the war doctrine precluded surface attacks at night (And for that reason no TBTs were installed either) and by the time they changed that, the subs already had radar and the most perfect way of measuring distance was that, hence the TBT did not need it.

To conduct manual TDC surface attacks in SH1 you must therefore if you want to be historically accurate do them only after you have radar, and follow this procedure:

- Lock the target on the TBT, so the view follows it
- Input AOB and estimated speed into TDC and start position keeper
- Go to radar station and read range to the contact you have chosen as objective (Use the bearing to it from TBT as reference to find it in the radar screen before you have PPI)
- Return to TDC station and enter the range
- Now you are ready to go to the TBT and shoot when you want