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BDOC NSS Exam Questions with 100% Correct Answers | Verified | Latest Update 2024
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BDOC NSS Exam Questions with 100% Correct Answers | Verified | Latest Update 2024
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BDOC NSS Exam.pdf file:///C:/Users/HP/Desktop/dddd/BDOC%20NSS%20ExamBDOC NSS Exam
1. Major Lights: a high intensity and reliable light exhibited from a fixed structure ormarine site
2. Primary Major Light: Established for making landfall from sea
3. Secondary Major Light: Established at harbor entrances
4. Minor Lights: Low to moderate intensity light used to mark a specific channel orlocation
5. Two considerations for minor lights: o Care should be taken NOT to confuseminor lights
with lighted buoys
o Established in harbors, channels, rivers, and isolated locations
6. Sector Lights: o Red: Danger Areas
o Green: Turning Points or best water areas
o White: Good water
7. Buoy Shapes: Can, Nun, Pillar, Spar, Sphere
8. Purpose of Buoys: Aids to navigation and used to mark
o Channels
o Shoals
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o Obstructions
o Warn of Dangers
9. IALA A: Red port, Green Starboard when returing to harbor (Countries in Africa,Asia,
Australia, Europe)
10. IALA B: Green port, Red Starboard when returning to harbor (Countries likeAmerica,
Japan, Korea, and the Philippines)
11. Variation: The angular difference between the true meridian and the magneticmeridian
o True Bearing = Magnetic Bearing + Variation
12. Deviation: The deflection right or left of the magnetic meridian caused bymagnetic
properties of the vessel
13. Gyrocompass Error: The difference between the true heading and gyrocom- pass heading.
Caused by: friction, ship's motion, electronic malfunction, and powerfluctuations
14. Permenant Magnetism: The stable magnetic condition of the ship, created byconstruction
and materials used
15. Induced Magnetisim: Magnetism acquired by the ships placement in theearth's
magnetic field
16. Datum: The mathematical model of the earth used to calculate position coordi-nates,
heights, and distances
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17. Datum used by US Navy: WGS 84 (World Geodetic System 1984)
18. Three segments of GPS: Control, User, Space
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