Coast Guard Test Aids to Navigation 2 — Questions and Answers
Question 1: What is the primary purpose of a lighthouse?
- To mark navigational hazards and aid vessel positioning (Correct answer)
- To serve as a Coast Guard station
- To monitor vessel traffic
- To provide shelter for mariners
Correct answer: To mark navigational hazards and aid vessel positioning
Lighthouses serve as fixed aids to navigation, warning mariners of hazards and helping them determine their position along a coastline.
Question 2: What does 'characteristic' mean when describing a light signal?
- The pattern of flashes and the color that identifies a specific light (Correct answer)
- The height of the lighthouse
- The range of the light in nautical miles
- The power source of the light
Correct answer: The pattern of flashes and the color that identifies a specific light
A light's characteristic is the unique combination of its flash pattern, color, and period that allows mariners to identify it from the Light List.
Question 3: What is the 'nominal range' of a navigational light?
- Distance the light can be seen in clear weather with standard atmospheric visibility (Correct answer)
- Distance the light can be seen in any weather
- Height of the light above water
- Intensity of the light in candela
Correct answer: Distance the light can be seen in clear weather with standard atmospheric visibility
Nominal range is the maximum distance at which a light can be seen in clear weather, based on its luminous intensity and standard meteorological visibility of 10 nautical miles.
Question 4: Which publication lists all US aids to navigation maintained by the Coast Guard?
- Light List (Correct answer)
- Coast Pilot
- Notices to Mariners
- Chart No. 1
Correct answer: Light List
The Light List, published by the Coast Guard, contains detailed information on all federal and private aids to navigation in US waters.
Question 5: What does 'ATONIS' stand for in Coast Guard operations?
- Aids to Navigation Information System (Correct answer)
- Automatic Tracking of Navigation and Identification Systems
- Aids to Navigation Inspection Standards
- Atlantic Navigation Information Service
Correct answer: Aids to Navigation Information System
ATONIS (Aids to Navigation Information System) is the Coast Guard database that tracks the status, maintenance, and discrepancies of all aids to navigation.
Question 6: What action should a mariner take upon discovering an uncharted obstruction near a navigational aid?
- Report it immediately to the nearest Coast Guard Sector (Correct answer)
- Mark it with a personal buoy
- Continue on course and log it in the ship's log
- Contact the local harbormaster only
Correct answer: Report it immediately to the nearest Coast Guard Sector
Mariners who discover hazards to navigation must report them promptly to the nearest Coast Guard Sector so a Notice to Mariners can be issued and corrective action taken.
Coast Guard Test Aids to Navigation 2
What is the primary purpose of a lighthouse?