OK, here's the periscope screen. On the right you see the TDC input dial, where you can enter speed, AoB and range/bearing. On the left are the TDC output dials, the target dial above and ownship dial below. You can see the torpedo was a stern shot. The gyro angle can be read with the inside set of numbers and the torpedo's course on the outside ring of numbers. On the upper target dial you can see the torpedo course on the outside ring (you have to read the opposite side, where the arrow is pointing, or add 180 to the number under the arrow), and the TTA (torpedo track angle) of about 50º measuring the angle at which the torpedo struck the side of the target.
You can also read the target's course at the zero bearing on the bow, see the number on the outside ring, about 59º. You can read the submarine's course on the ownship dial the same way, the number on the outside ring ajacent to the zero bearing, about 80º.
There is a ton of useful information in those two TDC output dials if you make yourself completely familiar with them they will help immensely in setting up your attacks.
Note that the game was just fine before EasyAoB came along and nothing is possible with EasyAoB that wasn't possible before it.