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Originally Posted by Alyebard
How you can obtain the CPA, with the 90º tool over the DRM ? I able to plot the rest of the questions.
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Once you have the DRM line...
1) Create a new contact
2) Connect contact to OwnShip
3) Set contact heading and speed based on DRM & SRM
4) On the connecting line display D-B-A
5) Position the contact on the DRM line such that the AoB display is 90°
...and there are at least 3 other ways to do it as well. The 90° bars are not used in this example. The only time you'd use the 90° bar tool is if you want to do some offset measurement.