A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | |
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1 | "A to Z" Use of Tools in this File | DOWNLOAD FILE TO YOUR HARD DRIVE - FILE-DOWNLOAD AS-EXCEL | ||||||||||||||||||||||||

2 | ||||||||||||||||||||||||||

3 | Use of the tools in this file begins when first sighting the enemy. | |||||||||||||||||||||||||

4 | ||||||||||||||||||||||||||

5 | I. On first sighting, achieve constant bearing to compute target speed: | |||||||||||||||||||||||||

6 | ||||||||||||||||||||||||||

7 | 1 | Quickly eyeball AOB and turn the boat to roughly match the enemy's course. | ||||||||||||||||||||||||

8 | ||||||||||||||||||||||||||

9 | 2 | Ensure the TDC is set to accept bearings from the UZO. | ||||||||||||||||||||||||

10 | ||||||||||||||||||||||||||

11 | 3 | Pick one ship and observe through the UZO how its bearing changes, using a feature such as the funnel as a guide. | ||||||||||||||||||||||||

12 | ||||||||||||||||||||||||||

13 | 4 | Adjust speed in such a way that the bearing only slightly moves. | ||||||||||||||||||||||||

14 | (hint: use the "both engines 10 slower" EOT setting to achieve speeds between the main EOT settings) | |||||||||||||||||||||||||

15 | ||||||||||||||||||||||||||

16 | 5 | Adjust course in small increments (preferably away from target) and observe the bearing change after each adjustment | ||||||||||||||||||||||||

17 | until the bearing line doesn't move off that spot on the target for at least a couple minutes. This exercise may take 10-15 min | |||||||||||||||||||||||||

18 | but the information gleaned pays dividends. | |||||||||||||||||||||||||

19 | ||||||||||||||||||||||||||

20 | 6 | At that constant bearing, have the TDC operator read off the exact bearing to the 10th degree and input in tab 2 Speed Calculation | ||||||||||||||||||||||||

21 | section as Constant Bearing. | |||||||||||||||||||||||||

22 | ||||||||||||||||||||||||||

23 | 7 | Estimate as closely as possible the AOB at this bearing and have it entered into the TDC, and input into tab 2 Speed Calculation | ||||||||||||||||||||||||

24 | section as Original AOB. | |||||||||||||||||||||||||

25 | ||||||||||||||||||||||||||

26 | 8 | Read calculated target speed from tab 2 Speed Calculation section and have entered into TDC for reference. | ||||||||||||||||||||||||

27 | ||||||||||||||||||||||||||

28 | 9 | Enter own course into tab 2 Speed Calculation section and make note of the resulting target course. We will use this for comparison | ||||||||||||||||||||||||

29 | later in overtaking the target. | |||||||||||||||||||||||||

30 | ||||||||||||||||||||||||||

31 | II. Begin overtaking the target and plot to refine course/speed estimate. If already ahead of target, skip this section: | |||||||||||||||||||||||||

32 | ||||||||||||||||||||||||||

33 | 1 | Accelerate to desired speed and turn to begin overtaking the target. | ||||||||||||||||||||||||

34 | ||||||||||||||||||||||||||

35 | 2 | Once speed stabilizes, enter it in the Range Calculation section of tab 1 as Own Spd. | ||||||||||||||||||||||||

36 | ||||||||||||||||||||||||||

37 | 3 | Enter estimated target speed from tab 2 in the Range Calculation section of tab 1 as Tgt Spd. | ||||||||||||||||||||||||

38 | ||||||||||||||||||||||||||

39 | 4 | Find a reference point on the target ship and start the timer, having TDC read off the exact bearing and | ||||||||||||||||||||||||

40 | entering it into Range Calculation section, 1st Brg. Mark own position on map. | |||||||||||||||||||||||||

41 | ||||||||||||||||||||||||||

42 | 5 | After exactly 1 minute, recenter on reference point on ship and have TDC read off exact bearing and enter | ||||||||||||||||||||||||

43 | into Range Calculation section, 2nd Brg. | |||||||||||||||||||||||||

44 | ||||||||||||||||||||||||||

45 | 6 | Have TDC read off AOB at 2nd bearing, and enter into Range Calculation section, AOB @ b2. | ||||||||||||||||||||||||

46 | ||||||||||||||||||||||||||

47 | 7 | Read target range as calculated in meters at bottom of Range Calculation. | ||||||||||||||||||||||||

48 | ||||||||||||||||||||||||||

49 | 8 | Enter own course into Range Calculation section, Own Course, and use this target range and the 1ST true bearing | ||||||||||||||||||||||||

50 | calculated below it to start a plot, using own marked position on map. Plot the target's course from this point, marking off | |||||||||||||||||||||||||

51 | where he'd be at intervals of 5 minutes (or any desired interval) along his course based on the speed estimate. | |||||||||||||||||||||||||

52 | ||||||||||||||||||||||||||

53 | 9 | Observe the target at these time intervals, estimating AOB and comparing observed bearing and rough | ||||||||||||||||||||||||

54 | range to the plotted points to further refine target course/speed. | |||||||||||||||||||||||||

55 | ||||||||||||||||||||||||||

56 | Alternatively, you could also forego the Range Calculation section and simply perform a plot using ranges derived from | |||||||||||||||||||||||||

57 | AOB and target length. See the Plot tab - fill in the section for the correponding observation. The reason for keeping a | |||||||||||||||||||||||||

58 | record of previous observations is that, if and when you estimate a more-accurate AOB, you will need to go back and | |||||||||||||||||||||||||

59 | readjust the AOBs of the previous observations by the same amount, thus truing up your plot (because the ranges will | |||||||||||||||||||||||||

60 | change). | |||||||||||||||||||||||||

61 | ||||||||||||||||||||||||||

62 | 10 | Use the AOB estimated at intervals to further refine the enemy course estimate using the Attack Disk section | ||||||||||||||||||||||||

63 | of tab 2 (Course from AOB). This section has a "Difference" field which compares the new course to the one originally | |||||||||||||||||||||||||

64 | estimated. Adjust the Original AOB in the Speed Calculation section of tab 2 by the amount of the difference so the difference | |||||||||||||||||||||||||

65 | zeroes out. This "trues up" the initial speed estimate from the constant bearing method for the new AOB. | |||||||||||||||||||||||||

66 | ||||||||||||||||||||||||||

67 | 11 | If so desired, use this more refined course to adjust the AOB in the Range Calculation section to "true up" | ||||||||||||||||||||||||

68 | the initial plot point and adjust the plot for the change in the speed estimate, going back and forth | |||||||||||||||||||||||||

69 | in this manner further refining course and speed, if time allows. | |||||||||||||||||||||||||

70 | ||||||||||||||||||||||||||

71 | DO NOT FORGET TO UPDATE THE AOB IN THE TDC FOR ANY NEW ESTIMATES THROUGHOUT! | |||||||||||||||||||||||||

72 | ||||||||||||||||||||||||||

73 | III.Check/determine target speed while closing with target: | |||||||||||||||||||||||||

74 | ||||||||||||||||||||||||||

75 | 1 | Having achieved a position far enough ahead where the approach can begin, turn toward and start approach. | ||||||||||||||||||||||||

76 | ||||||||||||||||||||||||||

77 | 2 | As target becomes more clear, continue refining the AOB (and thus target course) using the Attack Disk section in | ||||||||||||||||||||||||

78 | tab 2 (Course from AOB), adjusting the Original AOB in the tab 2 Speed Calculation to further refine speed. | |||||||||||||||||||||||||

79 | ||||||||||||||||||||||||||

80 | 3 | When close enough to see the masttips clearly, obtain a range by entering mast height, scope marks and magnification | ||||||||||||||||||||||||

81 | in the Speed Calculation section of tab 1. Alternatively, if you've plotted his track using the 0 AOB method in the tutorial, | |||||||||||||||||||||||||

82 | read range off where the bearing intersects his track. | |||||||||||||||||||||||||

83 | ||||||||||||||||||||||||||

84 | 4 | Pick a ship and a reference point on that ship and perform the "1-minute" timing exercise as before, noting exact bearings | ||||||||||||||||||||||||

85 | and entering these along with own speed and AOB at 2nd bearing in the appropriate fields in the Speed Calculation section of | |||||||||||||||||||||||||

86 | tab 1 (adjust AOB as necessary if appears different from observation). | |||||||||||||||||||||||||

87 | ||||||||||||||||||||||||||

88 | 5 | Read off calculated target speed and enter into TDC (along with any new AOB estimate). | ||||||||||||||||||||||||

89 | ||||||||||||||||||||||||||

90 | 6 | As a triple-check (or double-check in case plot wasn't done), you can do the "fixed-wire" method of checking speed. Turn | ||||||||||||||||||||||||

91 | bow-onto target and time how long it takes for the target to cross the wire (irrespective of AOB), then calculate speed: | |||||||||||||||||||||||||

92 | Target length / seconds x 1.94 | |||||||||||||||||||||||||

93 | The disadvantage here is the need to either stop or turn bow-on, which can be very impractical during an approach. | |||||||||||||||||||||||||

94 | ||||||||||||||||||||||||||

95 | IV. Shoot while minimizing gyro angle while turning: | |||||||||||||||||||||||||

96 | ||||||||||||||||||||||||||

97 | Every subsimmer has that "aha" moment eventually in their time while hunting high and low (some will get that joke, some won't) | |||||||||||||||||||||||||

98 | when they realize that, the smaller the gyro angle is at the time you shoot (i.e. the less the torpedo has to turn), the less range matters | |||||||||||||||||||||||||

99 | as a TDC input. At a 0 gyro angle, range has no impact to the solution at all. And so, historically, commanders strove to shoot at as close | |||||||||||||||||||||||||

100 | to a 0 gyro angle as possible to eliminate range as a factor. It is still a good idea to at least input a rough estimate of range into the TDC |

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