ASA ASA Coastal & Offshore Cruising 1 — Questions and Answers
Question 1: What is a 'watch system' on an offshore passage, and why is it used?
- A rotation schedule ensuring crew members rest while others maintain the helm and lookout (Correct answer)
- A method of timing tidal windows
- A technique for tracking weather patterns
- A schedule for radio check-ins with the Coast Guard
Correct answer: A rotation schedule ensuring crew members rest while others maintain the helm and lookout
A watch system divides the crew into rotating shifts so that the vessel is always manned while each sailor gets adequate rest during extended offshore passages.
Question 2: What does the term 'waypoint' mean in the context of coastal cruising navigation?
- A specific GPS coordinate used as an intermediate destination along a planned route (Correct answer)
- A buoy marking a channel entrance
- The final destination port
- A depth marking on a chart
Correct answer: A specific GPS coordinate used as an intermediate destination along a planned route
A waypoint is a geographic coordinate entered into a GPS or chartplotter that marks a specific point along a planned route, allowing the navigator to track progress and course.
Question 3: According to ASA 106 (Advanced Coastal Cruising) standards, what is the minimum recommended content for a float plan?
- Vessel description, crew list, departure/destination ports, planned route, and expected return time (Correct answer)
- Only the vessel name and hull ID number
- The skipper's name and credit card number
- The sail plan and weather forecast
Correct answer: Vessel description, crew list, departure/destination ports, planned route, and expected return time
A float plan should include vessel details, crew information, the planned route and waypoints, departure and arrival information, and expected return so rescuers can act quickly.
Question 4: What is 'dead reckoning' in coastal navigation?
- Estimating current position using a known starting point, course, speed, and elapsed time (Correct answer)
- Navigating by reading the depth sounder
- Using GPS to confirm position
- Calculating tidal height at a given time
Correct answer: Estimating current position using a known starting point, course, speed, and elapsed time
Dead reckoning calculates an estimated present position by projecting ahead from a known past position using the vessel's course, speed, and time traveled — without external fixes.
Question 5: When planning a coastal passage through a tidal inlet, what is the safest approach timing?
- Enter on a flooding tide near high water to maximize depth and avoid opposing currents (Correct answer)
- Enter at low water to see all hazards
- Enter at slack water regardless of tide height
- Enter at night to avoid boat traffic
Correct answer: Enter on a flooding tide near high water to maximize depth and avoid opposing currents
Entering a tidal inlet on a flooding tide near high water provides the most water depth over bars and shoals and aligns current with the vessel's direction of travel.
Question 6: What is the significance of the 'rhumb line' versus 'great circle' route on an offshore passage?
- A rhumb line follows a constant compass bearing but is longer; a great circle is the shortest distance but requires constant course changes (Correct answer)
- A rhumb line is the shortest route; a great circle follows compass headings
- Both routes are identical on all charts
- A rhumb line only applies to inshore navigation
Correct answer: A rhumb line follows a constant compass bearing but is longer; a great circle is the shortest distance but requires constant course changes
On a Mercator chart, a rhumb line appears straight and maintains a constant compass course but is longer than the shortest (great circle) path on the earth's curved surface.
ASA ASA Coastal & Offshore Cruising 1
What is a 'watch system' on an offshore passage, and why is it used?