No, this is a 3-bearing tool. It ONLY tells you AOB (at 1st bearing). The AOB at the other bearings is a matter of adding the bearing differences. From that you can figure out it's probable course. But not where it is, or how fast.
The steps to perform are on the front disk. There is no guide to it other than that. Measure bearings with equal time intervals. Then line up the differences. That's it. Just give it time.
The 4-bearing methods can tell you AOB/Course but also range and speed. Al that you need to know. And it takes only a time period longer, and a bit more geometry drawing.
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