AB Navigation & Watchstanding — Questions and Answers
Question 1: What is a ship's compass used for?
- Measure depth
- Calculate time
- Determine direction (Correct answer)
- Control speed
Correct answer: Determine direction
A ship's compass is a fundamental navigational instrument used to indicate the vessel's heading relative to magnetic or true north. This allows the crew to maintain a desired course and navigate accurately across the water.
Question 2: What is the purpose of a watchstanding log?
- Document crew shifts
- List meals served
- Record events during watch (Correct answer)
- Schedule maintenance
Correct answer: Record events during watch
A watchstanding log is an official document kept on the bridge or in the engine room during a watch. It serves to record all significant events, observations, and actions taken, providing a continuous and detailed history of the vessel's operations.
Question 3: What is a nautical mile?
- 1 mile
- 1.5 miles
- 1.1508 miles (Correct answer)
- 0.5 kilometers
Correct answer: 1.1508 miles
A nautical mile is a unit of distance used in marine and aviation navigation, defined as one minute of arc of a great circle. It is approximately 1.1508 statute miles (or 1,852 meters), making it a standard measure for distances at sea.
Question 4: What is a bearing in navigation?
- Ship speed
- Water depth
- Navigational direction (Correct answer)
- Wave height
Correct answer: Navigational direction
In navigation, a bearing is the horizontal direction of a point or object from an observer, usually expressed as an angle relative to a fixed reference point like true north or the ship's bow. It is crucial for plotting positions and determining courses.
Question 5: What does a lookout do?
- Clean decks
- Inspect cargo
- Observe surroundings (Correct answer)
- Manage engines
Correct answer: Observe surroundings
A lookout's primary duty is to maintain a continuous and vigilant watch by sight and hearing for other vessels, navigational hazards, and any changes in the environment. This is essential for preventing collisions and ensuring the safety of the vessel.
Question 6: What is a helm order?
- Cargo list
- Speed adjustment
- Steering instruction (Correct answer)
- Meal rotation
Correct answer: Steering instruction
A helm order is a command given to the helmsman (the person steering the ship) to direct the vessel's course. These instructions specify the desired rudder angle or heading, ensuring the ship follows the intended path.
Question 7: What tool is commonly used for plotting courses?
- Anchor chain
- Depth gauge
- Parallel ruler (Correct answer)
- Telescope
Correct answer: Parallel ruler
A parallel ruler is a common navigational tool used on charts to transfer a line of bearing or course from one part of the chart to another, typically to a compass rose. This allows navigators to accurately plot courses and positions.
Question 8: What does the term 'dead reckoning' refer to?
- Visual spotting
- GPS plotting
- Estimated position tracking (Correct answer)
- Wave prediction
Correct answer: Estimated position tracking
Dead reckoning is a method of navigation where a vessel's current position is estimated by calculating the course and distance traveled from a previously known position. It relies on speed, time, and direction, without external fixes, to approximate location.
Question 9: How often should a watchstander report to the bridge?
- Every 5 minutes
- Hourly
- When necessary (Correct answer)
- Only at shift end
Correct answer: When necessary
A watchstander should report to the bridge whenever there is a significant change in conditions, an observation that requires attention, or an instruction from the officer of the watch. Regular, unnecessary reports would be distracting, but critical information must be communicated promptly.
AB Navigation & Watchstanding
What is a ship's compass used for?