Radar Observer · Collision Avoidance — Action by Radar
Rule 8 guidance for a course alteration made to avoid a target detected by radar is that the alteration should be:
- AAs small as possible to save fuel
- BLarge enough to be readily apparent to the other vessel — a succession of small alterations should be avoided✓ Correct
- CMade only at the CPA
- DAlways to port
Explanation
Rule 8(b) requires that any alteration to avoid collision be large enough to be readily apparent to another vessel observing visually or by radar; a series of small alterations is hard to detect and should be avoided. Rule 8(a) requires the action be positive, made in ample time, and with good seamanship.
Authority: Navigation Rules, Rule 8(b)
Practice the full Radar Observer bank
Free spaced-repetition quizzing across 2550 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 — VRM
The variable range marker (VRM) on a radar measures:
- Controls — Clutter
The anti-clutter sea (STC / sensitivity-time control) is adjusted to: