What does the EM vector stand for?

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Multiple Choice

What does the EM vector stand for?

Explanation:
The main idea is that you model each vessel’s movement with a vector. The EM vector is the motion of the other vessel—its course and its speed. Knowing this, you can compare it with your own motion to determine how the two ships are moving relative to each other and to predict where you might pass closest (the CPA). It’s not your own ship’s motion, nor the abstract idea of relative motion itself, nor the point of closest approach. So the EM vector specifically encodes the other vessel’s course and speed.

The main idea is that you model each vessel’s movement with a vector. The EM vector is the motion of the other vessel—its course and its speed. Knowing this, you can compare it with your own motion to determine how the two ships are moving relative to each other and to predict where you might pass closest (the CPA). It’s not your own ship’s motion, nor the abstract idea of relative motion itself, nor the point of closest approach. So the EM vector specifically encodes the other vessel’s course and speed.

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