A RADAR contact will remain stationary on a relative motion RADAR display only when it is?

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On a relative motion radar display, your own ship is at the center and other targets are shown relative to your movement. A contact will stay in the same spot on the screen only if its velocity is identical to yours—the same course and the same speed. When both vessels share the same velocity vector, the relative velocity is zero, so the relative position doesn’t change and the contact appears stationary. If the other vessel travels on a different course or at a different speed, the relative velocity isn’t zero and the target will drift on the display, signaling that its motion differs from yours.