What does the ER vector stand for?

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Multiple Choice

What does the ER vector stand for?

Explanation:
The ER vector is the own ship’s motion—the course you’re steering and the speed you’re making good. It sets the reference frame for how you judge other vessels’ movements. When you assess a target, you compare its course and speed to your own ER; the difference between the two gives you the relative motion, telling you how the other ship is moving with respect to you. The other ideas listed—focusing on the other vessel’s course and speed, the general idea of relative motion, or the predicted Closest Point of Approach—are either descriptions of the other vessel, the concept you derive from the comparison, or a result of the analysis, not what the ER vector itself represents.

The ER vector is the own ship’s motion—the course you’re steering and the speed you’re making good. It sets the reference frame for how you judge other vessels’ movements. When you assess a target, you compare its course and speed to your own ER; the difference between the two gives you the relative motion, telling you how the other ship is moving with respect to you. The other ideas listed—focusing on the other vessel’s course and speed, the general idea of relative motion, or the predicted Closest Point of Approach—are either descriptions of the other vessel, the concept you derive from the comparison, or a result of the analysis, not what the ER vector itself represents.

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