Decreases sea return on the PPI scope.

Increases the sensitivity of the receiver for close targets.

Decreases sea return on the PPI scope.

Helps to increase the bearing resolution of targets.

Increases sea return on the PPI scope.

The STC circuit:

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🔍 Key Concepts

• STC (Sensitivity Time Control) in marine radar and what part of the picture it mainly affects (very close range or long range?) • The meaning of sea return/sea clutter on a PPI (Plan Position Indicator) scope • The difference between changing receiver sensitivity and changing bearing resolution

💭 Think About

• Think about why small boats often use STC or sea-clutter controls in choppy conditions: what are they trying to reduce on the radar screen? • Does STC make close-in targets easier or harder to see when the sea is rough? How would that affect the appearance of sea echoes near your own ship? • Which control on a radar is normally associated with improving bearing resolution: is it STC, or is it something like beamwidth/antenna characteristics?

✅ Before You Answer

• Verify whether STC increases or decreases receiver gain for very short ranges close to your own vessel. • Confirm that sea return/sea clutter refers to unwanted echoes from waves near the ship, not from distant targets. • Check which option correctly describes an effect on sea return without confusing it with bearing resolution or long-range sensitivity.

🔍 Key Concepts

💭 Think About

✅ Before You Answer