[finchOU]

I'll also add that again...you need to play around with the TDC to figure it out. If you know you are on an exact parallel course to the target then you must turn your scope to 270 or 90 degrees (which ever direction you are shooting the target) first before you enter data into the TDC. Well ....you don't have to but this takes the math and guess work out of the equation.

Because the Torpedo has to go a certain distance from your Uboat before turning that 90 degrees....Distance to the target is pretty critical to get good accurate hits.