[Heibges]

Speed: Use the Matching Speed Method. After determining the targets course, set the same course, and adjust your speed until the bearing with the target no longer changes.

AoB: Once you know the target course, determining AoB is easy.
1. If your are bow to bow AoB= 0°
2. If you are bow to stern (chasing target) AoB = 180°
3. If you are approaching your target at a 90° attack angle (not to be confused with 90° AoB) there is a defined relationship between AoB and Bearing. This is true if and only if you are approaching on a 90° attack angle.

On targets crossing your path moving right to left:
Bearing 45° = AoB 45° port
Bearing 000° = AoB 90° port

On targets crossing your path moving left to right
Bearing 315° = AoB 45° starboard
Bearing 000°= AoB 90° starboard

I almost never fire over Range 1000m, and I give 10° of lead on my shots, so I fire on bearing 10° (right to left targets) and bearing 350° (left to right targets) which will have AoB of 80°port and 80°starboard respectively.

Range: I use range estimation using the scale on the UZO and Attack Periscope and measure the length of my targets.

At 1200m
C2 Merchant = 6 Units long
C3 Merchant = 7 Units long

At 600m
C2 Merchant = 12 Units Long
C3 Merhcant = 14 Units Long

This is the MILS method, but I'm not sure if the scale on the Periscope and UZO and in MILS, but that is irrelevant anyway as long as the scale is consitant.

To summarize

1. You should have target course and speed analyzed when you are 10,000m from the target and before you plan your overhaul manuever.

2. You should know the AoB because you know the target course, and you have calculated your firing position.

3. Make a last minute correction for range, and Torpedoes Los!