Navigation General · ARPA
A known limitation of ARPA target tracking is 'target swap', which can occur when:
- ATwo tracked targets pass close to each other and the processor exchanges their tracks✓ Correct
- BThe radar is switched off
- CA target changes color
- DThe range scale is changed once
Explanation
When two targets pass close aboard one another, the ARPA may lose and reacquire them on the wrong tracks (target swap), suddenly attributing one target's history and vectors to the other. The operator must watch closely and not blindly trust the vectors during close encounters.
Authority: IMO Performance Standards for ARPA; ARPA limitations
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