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Originally Posted by Corsair
Once you have plotted the target course, use the protractor to measure the AOB. One leg on target course, second leg from target to you sub. The angle is there.
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I find it very difficult to use the angle tool to measure AOB and then go to either the UZO/Periscope view or directly to the Target Data Computer to input AOB. By the time you do this it has changed.
Therefore, the easy way:
1. You should be on an intercept course with target course.
2. On Nav map plot the target course.
3. Go to UZO/Periscope view and put on zero degrees bearing.
4. Then use the angle tool. First point is placed on your course. Second point is placed on the intercept point. Third point is placed on the target course in the direction of its travel.
5. Read the angle, this is the AOB at your intercept point. As long as your course and the target course does not change, this will always be the AOB at the intercept of the two courses. Thus, you have the time to go to the UZO/Periscope view and input the exact angle into the AOB section. Make sure you x out all other information first and don't forget to doubleclick so it is sent to the TDC.
6. Now you can rotate the UZO or Periscope and the exact AOB will automaticaly be updated.
It is also my assumption that as long as the target course remains the same, you can even make minor course changes and these will be reflected automatically by the TDC.
If the target begins to zig-zag, do not change your computed AOB. Change (lower) the target speed. The target may well be traveling at the original computed speed but his relative speed from point A to Point B will be slower. Compute this by time and distance traveled.
Hope this is helpful.