The rules state a proper lookout uses all available means including learning and using radar to safely navigate and avoid a collision.
If an object gets closer and remains on the same bearing, you will collide. Putting a radar electronic bearing line (EBL) on a target with echo trails turned on is an easy way to determine how close a target will approach. For examples, review:
Some other good information can be found on the Videos and Info page at:
End of R of R Basics lesson.
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