NauticEd International Sailing License
and Credentials (SLC) Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2027
Q&A | Instant Download Pdf
1. What is the primary purpose of a nautical chart?
A. To show only marina locations
B. To provide information about depths, hazards, aids to navigation, and
coastline
C. To predict wind speed
D. To calculate engine horsepower
Answer: B. To provide information about depths, hazards, aids to
navigation, and coastline
Rationale: A nautical chart provides the essential geographic and
navigational information needed to plan and safely conduct a voyage.
,2. What does a charted depth normally refer to when using a traditional
nautical chart?
A. Height above sea level
B. Depth relative to the chart datum
C. Maximum depth of the ocean
D. Depth measured from the masthead
Answer: B. Depth relative to the chart datum
Rationale: Charted depths are referenced to a defined chart datum,
allowing the navigator to determine the available depth when tide height
is considered.
3. A vessel is steering 090° true. In which direction is it heading?
A. North
B. South
C. East
D. West
Answer: C. East
Rationale: True bearings are measured clockwise from true north; 090° is
directly east.
4. What is the difference between true north and magnetic north called?
,A. Deviation
B. Variation
C. Leeway
D. Drift
Answer: B. Variation
Rationale: Magnetic variation, also called declination, is the angular
difference between true north and magnetic north.
5. What is compass deviation?
A. Error caused by local magnetic influences aboard the vessel
B. Difference between high and low tide
C. Difference between true wind and apparent wind
D. Error caused by ocean currents
Answer: A. Error caused by local magnetic influences aboard the vessel
Rationale: Deviation is caused by magnetic fields and ferrous materials on
or near the vessel and can vary with heading.
6. A vessel's compass course is 090° magnetic, and magnetic variation is
10° east. What is the approximate true course?
A. 080°
B. 090°
, C. 100°
D. 110°
Answer: C. 100°
Rationale: With easterly variation, magnetic direction is converted to true
by adding the easterly variation: 090° + 10° = 100°.
7. What is the purpose of a navigation fix?
A. To determine the vessel's position
B. To increase engine speed
C. To measure wind pressure
D. To determine fuel consumption
Answer: A. To determine the vessel's position
Rationale: A fix establishes the vessel's position using one or more
observations, such as bearings, GPS, ranges, or visual references.
8. What does GPS primarily provide to a navigator?
A. Wind direction
B. Vessel position, course, and speed information
C. Depth below the keel
D. Tide height
Answer: B. Vessel position, course, and speed information
and Credentials (SLC) Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2027
Q&A | Instant Download Pdf
1. What is the primary purpose of a nautical chart?
A. To show only marina locations
B. To provide information about depths, hazards, aids to navigation, and
coastline
C. To predict wind speed
D. To calculate engine horsepower
Answer: B. To provide information about depths, hazards, aids to
navigation, and coastline
Rationale: A nautical chart provides the essential geographic and
navigational information needed to plan and safely conduct a voyage.
,2. What does a charted depth normally refer to when using a traditional
nautical chart?
A. Height above sea level
B. Depth relative to the chart datum
C. Maximum depth of the ocean
D. Depth measured from the masthead
Answer: B. Depth relative to the chart datum
Rationale: Charted depths are referenced to a defined chart datum,
allowing the navigator to determine the available depth when tide height
is considered.
3. A vessel is steering 090° true. In which direction is it heading?
A. North
B. South
C. East
D. West
Answer: C. East
Rationale: True bearings are measured clockwise from true north; 090° is
directly east.
4. What is the difference between true north and magnetic north called?
,A. Deviation
B. Variation
C. Leeway
D. Drift
Answer: B. Variation
Rationale: Magnetic variation, also called declination, is the angular
difference between true north and magnetic north.
5. What is compass deviation?
A. Error caused by local magnetic influences aboard the vessel
B. Difference between high and low tide
C. Difference between true wind and apparent wind
D. Error caused by ocean currents
Answer: A. Error caused by local magnetic influences aboard the vessel
Rationale: Deviation is caused by magnetic fields and ferrous materials on
or near the vessel and can vary with heading.
6. A vessel's compass course is 090° magnetic, and magnetic variation is
10° east. What is the approximate true course?
A. 080°
B. 090°
, C. 100°
D. 110°
Answer: C. 100°
Rationale: With easterly variation, magnetic direction is converted to true
by adding the easterly variation: 090° + 10° = 100°.
7. What is the purpose of a navigation fix?
A. To determine the vessel's position
B. To increase engine speed
C. To measure wind pressure
D. To determine fuel consumption
Answer: A. To determine the vessel's position
Rationale: A fix establishes the vessel's position using one or more
observations, such as bearings, GPS, ranges, or visual references.
8. What does GPS primarily provide to a navigator?
A. Wind direction
B. Vessel position, course, and speed information
C. Depth below the keel
D. Tide height
Answer: B. Vessel position, course, and speed information
