USCG Exam Practice · Radar fundamentals and ARPA basics
Marine radar obtains a direct fix by measuring which two quantities to a target?
- ASpeed and bearing
- BRange and bearing✓ correct
- CRange and heading
- DSpeed and range
Why B is correct
Bowditch Ch. 13 §1301 states that range and bearing to a target give a direct fix. Speed is derived from successive positions, not directly measured by the radar pulse.
Cited:Bowditch Ch. 13 §1301
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