Radar Observer · Operation — Performance Monitor
The radar performance monitor (echo box / transponder check) lets the operator confirm that:
- AThe set's transmitted power and receiver sensitivity are within normal limits (a 'sun'/plume pattern of expected length appears)✓ Correct
- BThe ship is on course
- CThe compass is aligned
- DThe chart is up to date
Explanation
A performance monitor produces a known test pattern (e.g., a plume or 'sun' of a certain length, or a transponder return) whose appearance verifies the transmitter output and receiver sensitivity are normal. A shrinking pattern warns of deteriorating performance before targets are lost. It checks the set, not tuning of a specific picture.
Authority: IMO Performance Standards for Radar; Bowditch
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