Radar Observer · Controls — VRM
The variable range marker (VRM) on a radar measures:
- AA target's bearing
- BA target's range✓ Correct
- CThe vessel's heading
- DThe pulse repetition rate
Explanation
The VRM is an adjustable range ring set onto a target to read its distance. Together the EBL (bearing) and VRM (range) fix a contact's position relative to your ship.
Authority: Radar Operation (USCG topic)
Practice the full Radar Observer bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Radar Observer questions
- Display — Motion
On a relative-motion radar display, your own ship is:
- Collision Avoidance — CPA
The closest point of approach (CPA) of a radar target is:
- Collision Avoidance — TCPA
TCPA on a radar/ARPA readout represents the:
- Controls — EBL
The electronic bearing line (EBL) on a radar is used to:
- Controls — Clutter
The anti-clutter sea (STC / sensitivity-time control) is adjusted to:
- Controls — Clutter
The anti-clutter rain (FTC / fast-time-constant) control is used to: