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 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 |