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Multiple Choice

What does a relative vector represent?

A relative vector shows how the tracked target is moving from the perspective of your own ship. It gives the target’s velocity components as observed in the moving frame of the observer, typically described by how fast the range is changing and how fast the bearing is changing. Because it is expressed relative to your vessel, you can project where the target will be in the near future by advancing along that relative velocity. That makes it the best representation of the target’s predicted future movement as seen from your ship. It isn’t the current velocity of the sea, nor your own ship’s heading, and it’s not the target’s motion in the world frame unless you convert it using your own ship’s motion.

A relative vector shows how the tracked target is moving from the perspective of your own ship. It gives the target’s velocity components as observed in the moving frame of the observer, typically described by how fast the range is changing and how fast the bearing is changing. Because it is expressed relative to your vessel, you can project where the target will be in the near future by advancing along that relative velocity. That makes it the best representation of the target’s predicted future movement as seen from your ship. It isn’t the current velocity of the sea, nor your own ship’s heading, and it’s not the target’s motion in the world frame unless you convert it using your own ship’s motion.