Radar Observer · Controls — STC
Sensitivity Time Control (STC), also called the sea-clutter or anti-clutter sea control, reduces:
- AReturns from rain at long range
- BStrong close-in returns from waves near own ship✓ Correct
- CThe transmitter power
- DInterference from other radars
Explanation
STC progressively reduces receiver gain for close-range echoes, suppressing the bright sea clutter near own ship. Overuse can erase small close targets, so it must be applied only as much as needed.
Authority: Radar Navigation — Clutter Controls
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 — VRM
The variable range marker (VRM) on a radar measures:
- Controls — Clutter
The anti-clutter sea (STC / sensitivity-time control) is adjusted to: