Figure 4 – Example of a relative motion problem. The target ship is on a course of 000° T at 25 knots. Our ship is on his starboard beam at a range of 10,000 yards and has a maximum speed of 35 knots. To reach a position 30° forward of the target’s beam and at a range of 3,000 yards, our ship must steer course 326° T at 35 knots. It will take approximately 11 minutes to reach the desired position.
F12 Torpedo Director
DC has a very realistic, functional torpedo director built in. Most of the time one will probably order torpedo attacks from F2 CIC, but the F12 Torpedo Director is an excellent resource to maximize your chances of hitting. It also provides some additional control over your torpedo attack, if desired. For example, you can use it to release torpedoes at an optimum firing position, or to control the number of torpedoes fired.
The main part of the display is in the center, which displays the same information shown in Figure 2. The upper “dial” is always the target vessel, and the lower “dial” is always your vessel. A vertical line connecting the centers of the two “dials” is the LOS.
The upper “dial” has three disks stacked upon each other to display relevant target information. The top disk is a TA pointer, which points in the correct direction relative to the LOS. The middle disk has an outline of the target vessel, which rotates to point the target ship’s bow in the correct direction relative to the LOS. Around the circumference of the middle disk is a relative bearing scale, which indicates directions relative to the target ship’s bow. The scale is marked at each 10° and labeled at each 20° . A whole number is used to indicate tens of degrees. 0 (000° R) is dead ahead of the target, 9 (090° R) is off the target’s starboard beam, 18 (180° R) is dead astern of the target and 27 (270° R) is off the target’s port beam. To maximize chances of a hit, we want the TA pointer pointing at 9 or 27. The lowest disk is a true bearing indicator. It is marked every 10° with a whole number indicating tens of degrees. This disk indicates the target’s true course and our bearing from the target, but it’s not essential to solving the aiming problem.
The lower “dial” also has three disks stacked upon each other to display relevant own ship information. The top disk is an SA pointer, which points in the correct direction relative to the LOS. Note that the SA pointer on the own ship “dial” and the TA pointer on the target “dial” are always parallel to each other and offset from the LOS by the same angle. The middle disk has an outline of your ship, which rotates to point the your ship’s bow in the correct direction relative to the LOS. Around the circumference of the middle disk is a relative bearing scale, marked in the same manner as the relative bearing scale on the target “dial.” It indicates directions relative to your ship’s bow. The SA pointer must be pointing in a direction that allows the torpedo launcher to fire (note: we can use the offset angle knob to be able to shoot — more later). The lowest disk is a true bearing indicator, marked in the same manner as the target “dial.” This disk indicates your true course and the target’s true bearing from you, but again, it’s not essential to solving the aiming problem. Note that both the target “dial” true bearing indicator and the own ship “dial” true bearing indicator are always aligned with each other.