Radar Observer Unlimited (ROU) Practice Exam

What is the function of the Variable Range Marker on a radar display?

A user-directed graphical line tool to indicate or measure a bearing on the radar display A user-directed graphical circle tool to indicate or measure a range on the radar display A mode where own ship stays in the center A stabilized heading input

Correct Answer:

A user-directed graphical circle tool to indicate or measure a range on the radar display

Explanation:

The Variable Range Marker is a circular, user-adjustable range guide on the radar screen. You drag or resize the circle so its edge passes through a target, and the radius tells you the distance from your own ship to that target. Because the circle represents a fixed distance in all directions, it’s ideal for measuring range, not bearing. It’s typically centered on your own ship symbol on the display, unlike tools that indicate a specific bearing with a line. Other display options, like keeping own ship at the center or inputting a stabilized heading, are separate controls, not the VRM itself.

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