USCG Exam PracticeCompass variation and deviation; T-V-M-D-C
On a nautical chart, the compass rose displays two concentric rings. What does the INNER ring indicate?
- A. True bearings referenced to geographic north
- ✓ Magnetic bearings reflecting local variationCorrect
- C. Compass bearings corrected for deviation
- D. Gyrocompass bearings corrected for gyro error
Why B is correct
The compass rose has an outer ring showing true bearings and an inner ring showing magnetic bearings, with the local variation and annual change noted at the centre. Deviation is a vessel-specific error not depicted on the chart rose.