ASA 105 Coastal Navigation Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025 Q&A | Instant Download Pdf

ASA 105 Coastal Navigation Practice
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download Pdf


1. What is the primary tool used to measure distances on a nautical
chart?

 Dividers

 Parallel rulers

 Compass

 Sextant
Dividers are used to measure the distance between two points on a
chart, often in nautical miles.

2. One nautical mile equals how many feet?

 5,280

 6,076

 6,000

, 5,000
A nautical mile is defined as one minute of latitude and equals 6,076
feet.

3. What is a line of position (LOP)?

 A bearing to a lighthouse

 A line along which the vessel is known to be located

 The vessel's course

 A range line
An LOP is a navigational tool indicating a position somewhere along
a line on the chart.

4. What is "variation" in navigation?

 Wind shift

 The difference between true north and magnetic north

 Change in current direction

 Change in heading
Variation is the angle between true north and magnetic north, found
on the compass rose of a chart.

5. What is the primary purpose of the compass rose on a nautical chart?

 Mark wind direction

 Indicate chart depth

 Show true and magnetic directions

, Measure time
The compass rose shows both true and magnetic north for accurate
course plotting.

6. What is "deviation"?

 Error in compass caused by weather

 Compass error caused by local magnetic fields aboard the vessel

 Tidal change

 Wind shift
Deviation is specific to a vessel and varies with heading due to
onboard magnetic interference.

7. If a magnetic bearing is 100° and the deviation is +2°, what is the
compass bearing?

 98°

 102°

 100°

 96°
Compass bearing = Magnetic bearing - Deviation.

8. What does a "fix" represent?

 The estimated future position

 An exact location of the vessel determined by intersecting LOPs

 A compass correction

,  GPS position only
A fix is a known position determined by two or more intersecting
lines of position.

9. What is dead reckoning?

 GPS navigation

 Plotting position based on course and speed over time

 Using buoys for positioning

 Taking compass bearings
Dead reckoning uses course, speed, and time from a known point to
estimate a position.

10. What is the standard unit of speed in nautical navigation?

 Miles per hour

 Knots

 Kilometers per hour

 Feet per second
Knots are nautical miles per hour and are the standard for vessel
speed.

11. If your vessel travels at 6 knots for 2 hours, how far have you
traveled?

 10 NM

 12 NM

 8 NM