You've got the arrows right as far as the top one is impact angle and the lower one is torpedo gyro angle. The one that you are looking for to check the solution is the inner ring on the own ship dial (the bottom one). If you pop the scope up and the inner dial reads 40 and the target is roughly on 40 degrees on the scope, you know you’ve got a fairly accurate solution.
The great thing about the US TDC over the German one was that it continually updated the torpedo gyro angles. This means that the time it takes for the outer doors to open and for the tube to fire won’t throw off your solution. You also don’t even need the scope raised or pointed at the target to fire either as long as the PK is activated.
If your initial speed, range, and AOB are accurate and the target doesn’t change course or speed, you only have to pop the scope up to confirm the bearing with the PK.
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