ASA 105 COASTAL NAVIGATION EXAMINATION
CERTIFICATION EXAMINATION COMPLETE QUESTIONS
AND DETAILED SOLUTIONS LATEST UPDATE THIS YEAR
JUST RELEASED
Exam Coverage Summary
1. Chart Reading and Symbols — Understanding nautical charts, chart scales, symbols,
depths, aids to navigation, and chart notes.
2. Latitude and Longitude — Determining geographic position using latitude, longitude,
degrees, minutes, and seconds.
3. Distance and Speed — Using nautical miles, knots, distance-time-speed relationships,
and chart dividers.
4. Dead Reckoning (DR) — Projecting vessel position using course, speed, time, and
estimated current or wind effects.
5. Course and Bearing — Working with true, magnetic, and compass directions and
converting between them.
6. Variation and Deviation — Applying magnetic variation and compass deviation correctly
to navigation calculations.
7. Piloting and Position Fixing — Using visual bearings, ranges, lines of position, and
multiple observations to establish position.
8. Tides and Currents — Interpreting tide tables, tidal heights, tidal currents, set, drift, and
current vectors.
9. Electronic and Traditional Navigation — Understanding GPS, chartplotters, depth
sounders, radar, and their relationship to paper-chart navigation.
10. Passage Planning and Navigation Safety — Planning routes, identifying hazards,
allowing for leeway and current, monitoring progress, and maintaining safe navigation
practices.
ASA 105 Coastal Navigation
Question 1
A nautical chart is primarily designed to provide mariners with what type of
information needed for safe coastal navigation?
,A. Weather forecasts and long-range climate predictions
B. Water depths, hazards, aids to navigation, and geographic features
C. Engine specifications and fuel consumption data
D. Radio communication frequencies for all vessels
Answer: B
Rationale: Nautical charts provide essential navigational information, including
depths, shoals, rocks, wrecks, channels, landmarks, and navigational aids.
Question 2
When determining a vessel's position using latitude and longitude, which
coordinate is measured north or south of the Equator?
A. Longitude
B. Bearing
C. Latitude
D. Variation
Answer: C
Rationale: Latitude measures angular distance north or south of the Equator,
while longitude measures angular distance east or west of the Prime Meridian.
Question 3
A vessel travels at a speed of 6 knots for three hours without considering current
or wind effects. Approximately how far will the vessel travel?
A. 2 nautical miles
B. 9 nautical miles
C. 18 nautical miles
D. 36 nautical miles
,Answer: C
Rationale: Distance equals speed multiplied by time. At 6 knots for 3 hours, the
vessel travels 18 nautical miles.
Question 4
On a nautical chart, one minute of latitude represents approximately what
distance on the Earth's surface?
A. One nautical mile
B. One statute mile
C. Ten nautical miles
D. One kilometer
Answer: A
Rationale: One minute of latitude is approximately equal to one nautical mile,
making the latitude scale useful for measuring distances on charts.
Question 5
When measuring distance on a nautical chart, why should the navigator normally
use the latitude scale rather than the longitude scale?
A. Latitude is always printed in larger numbers
B. One minute of latitude corresponds approximately to one nautical mile
C. Longitude cannot be measured accurately on charts
D. Longitude changes only with vessel speed
Answer: B
Rationale: Nautical miles are based on latitude, with one minute of latitude
approximately equal to one nautical mile.
, Question 6
A vessel's dead reckoning position is calculated primarily from which combination
of navigational information?
A. Course steered, speed, and elapsed time
B. Wind direction, air temperature, and barometric pressure
C. Depth, visibility, and cloud cover
D. Compass deviation, tide height, and chart scale
Answer: A
Rationale: Dead reckoning projects position from a known starting point using
course, speed, and time, with additional estimated effects sometimes
incorporated.
Question 7
A vessel is steering a compass course, but the navigator needs to determine the
corresponding true course. Which factors may need to be applied?
A. Depth and distance only
B. Variation and deviation
C. Tide height and air pressure
D. Wind speed and vessel displacement
Answer: B
Rationale: Compass readings differ from true directions because of compass
deviation and magnetic variation. Both must be considered when converting
between compass, magnetic, and true directions.
CERTIFICATION EXAMINATION COMPLETE QUESTIONS
AND DETAILED SOLUTIONS LATEST UPDATE THIS YEAR
JUST RELEASED
Exam Coverage Summary
1. Chart Reading and Symbols — Understanding nautical charts, chart scales, symbols,
depths, aids to navigation, and chart notes.
2. Latitude and Longitude — Determining geographic position using latitude, longitude,
degrees, minutes, and seconds.
3. Distance and Speed — Using nautical miles, knots, distance-time-speed relationships,
and chart dividers.
4. Dead Reckoning (DR) — Projecting vessel position using course, speed, time, and
estimated current or wind effects.
5. Course and Bearing — Working with true, magnetic, and compass directions and
converting between them.
6. Variation and Deviation — Applying magnetic variation and compass deviation correctly
to navigation calculations.
7. Piloting and Position Fixing — Using visual bearings, ranges, lines of position, and
multiple observations to establish position.
8. Tides and Currents — Interpreting tide tables, tidal heights, tidal currents, set, drift, and
current vectors.
9. Electronic and Traditional Navigation — Understanding GPS, chartplotters, depth
sounders, radar, and their relationship to paper-chart navigation.
10. Passage Planning and Navigation Safety — Planning routes, identifying hazards,
allowing for leeway and current, monitoring progress, and maintaining safe navigation
practices.
ASA 105 Coastal Navigation
Question 1
A nautical chart is primarily designed to provide mariners with what type of
information needed for safe coastal navigation?
,A. Weather forecasts and long-range climate predictions
B. Water depths, hazards, aids to navigation, and geographic features
C. Engine specifications and fuel consumption data
D. Radio communication frequencies for all vessels
Answer: B
Rationale: Nautical charts provide essential navigational information, including
depths, shoals, rocks, wrecks, channels, landmarks, and navigational aids.
Question 2
When determining a vessel's position using latitude and longitude, which
coordinate is measured north or south of the Equator?
A. Longitude
B. Bearing
C. Latitude
D. Variation
Answer: C
Rationale: Latitude measures angular distance north or south of the Equator,
while longitude measures angular distance east or west of the Prime Meridian.
Question 3
A vessel travels at a speed of 6 knots for three hours without considering current
or wind effects. Approximately how far will the vessel travel?
A. 2 nautical miles
B. 9 nautical miles
C. 18 nautical miles
D. 36 nautical miles
,Answer: C
Rationale: Distance equals speed multiplied by time. At 6 knots for 3 hours, the
vessel travels 18 nautical miles.
Question 4
On a nautical chart, one minute of latitude represents approximately what
distance on the Earth's surface?
A. One nautical mile
B. One statute mile
C. Ten nautical miles
D. One kilometer
Answer: A
Rationale: One minute of latitude is approximately equal to one nautical mile,
making the latitude scale useful for measuring distances on charts.
Question 5
When measuring distance on a nautical chart, why should the navigator normally
use the latitude scale rather than the longitude scale?
A. Latitude is always printed in larger numbers
B. One minute of latitude corresponds approximately to one nautical mile
C. Longitude cannot be measured accurately on charts
D. Longitude changes only with vessel speed
Answer: B
Rationale: Nautical miles are based on latitude, with one minute of latitude
approximately equal to one nautical mile.
, Question 6
A vessel's dead reckoning position is calculated primarily from which combination
of navigational information?
A. Course steered, speed, and elapsed time
B. Wind direction, air temperature, and barometric pressure
C. Depth, visibility, and cloud cover
D. Compass deviation, tide height, and chart scale
Answer: A
Rationale: Dead reckoning projects position from a known starting point using
course, speed, and time, with additional estimated effects sometimes
incorporated.
Question 7
A vessel is steering a compass course, but the navigator needs to determine the
corresponding true course. Which factors may need to be applied?
A. Depth and distance only
B. Variation and deviation
C. Tide height and air pressure
D. Wind speed and vessel displacement
Answer: B
Rationale: Compass readings differ from true directions because of compass
deviation and magnetic variation. Both must be considered when converting
between compass, magnetic, and true directions.
