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Determining AOB
The AOB can be determined in several different ways
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90° solution
If you have maneuvered your U-boat to be perpendicular (ie at 90°) to the target's course, then you can assume a 90° AOB (to port or starboard as appropriate) when the target is directly in front of you (at a 0° bearing in your periscope or UZO.) At AOB values close to 90°, it is not essential to be highly accurate with your AOB value, particularly when attacking at close range.
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Visual estimation
An experienced captain can accurately estimate the AOB of a target purely from sight. The
recognition manual has some images that can assist with this task. This is the least accurate of the methods, unless you are
very good!
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Protractor method
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Draw the first line from the target's future course to the centre of the target
If you have plotted a future course for the target on the navigation map, then you can use the built-in
protractor tool to quickly and easily find the AOB.
Take a bearing to the target (this will be used later), and immediately note the position of the target on the navigation map using the Marker tool. If using the
Three Minute Rule to determine target speed, then it can be convenient to use the second timing mark for this purpose. In that case, after making the second mark switch immediately to your periscope or UZO view and note the bearing to the target at that time. It is useful to unlock the target from the optics view so that your optics will stay on that bearing for when we need to enter the AOB later.
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Draw the first line from the target's future course to the centre of the target
By making a mark, instead of using the ship icon shown on the navigation map, we remove any confusion caused by the ships movement during the plotting. We can also take a little longer to ensure that the lines are plotted accurately. As long as we know the bearing to the target at the time the mark was made, we can still correctly enter the AOB after any period of time has passed.
Using the protractor tool, draw the first line from a position along the target's future course, to the centre of the target. Click once to lock it in, and then draw the second leg precisely to the centre of your U-Boat. Click again to complete the operation.
The angle shown on the protractor tool is the Angle on Bow. You can determine port or starboard simply by looking at the location of your U-boat in relation to the target. In this example, the angle is 68°. As we are to the starboard of the target (which is heading south), our AOB is 68° starboard.
We can now set our bearing (by rotating the periscope or UZO) back to the value noted at the time of determining the AOB. Once that is correct, we can enter our AOB using either the notepad or directly into the TDC.
True Bearing
From SilentHunterIII Community Manual
The
true bearing of an object is the bearing expressed as the number of degrees from 0° (north).
When using the optics in SHIII, you will see the
Relative Bearing, which is the bearing from your own heading, rather than from north. If the U-boat happens to be pointing exactly north (0°) then the True and Relative bearings will be the same.
It is possible to convert from relative bearing to true bearing using the following formua
True Bearing = Relative Bearing + Own Heading (minus 360 if result is greater than 360) some examples:
If the U-Boat is heading at 45° and we are viewing a target in the periscope with the bearing showing as 220° then the true bearing is 220° + 45° = 265°
If the U-Boat is heading at 330° and the target's relative bearing is 70°, then the true bearing is 330° + 70° = 400°, minus 360° = 40°.
Calculation
If you know the course of the target, as well as its bearing from the U-Boat, then you can accurately calculate the AOB.
You must know the
True Bearing of the target - that is, the bearing from zero degrees (North), not from your own heading.
AoB = Target True Bearing - target course (plus/minus 180° to get the result within -180 to +180°)If the final figure is positive, then the AOB will be to
starboard. If negative it will be to
port. Note that even if your initial subtraction results in a figure between -180° and 180°, you must still +/- 180°. Some examples:
Let's assume a target course of
50°.
Depending on the
True Bearing to the target, the AOB will be calculated as follows:
330°
330 - 50 = +280, minus 180 = +100
100° starboard
260°
260 - 50 = +210, minus 180 = +30
30° starboard
140°
140 - 50 = +90, minus 180 = -90
90° port
20°
20 - 50 = -30, plus 180 = +150
150° starboard
230°
230 - 50 = +180, minus 180 = 0
0°