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ASA 105 Actual Exam Questions and
Answers with Rationales 2026/2027 |
Version 1 | Coastal Navigation
Certification | Pass Guarantee
Q001: While plotting a fix on NOAA Chart 18465, you note that your GPS
position is 47° 18.25' N, 122° 51.60' W. The nearest sounding is 18 ft. If the
charted datum is MLLW and the tide is +7.2 ft, what is the actual water depth at
this time?
Options:
A. 11.2 ft
B. 18.0 ft
C. 25.2 ft
D. 32.4 ft
ANSWER: C
Q002: Your dead-reckoning (DR) track from buoy “R ‘2’” to waypoint “B” is 185°
T at 6.0 kt. A 1.8 kt ebb current sets 340° T. What is the estimated SOG (speed
over ground) once the current is applied?
Options:
A. 4.2 kt
B. 5.4 kt
C. 7.2 kt
D. 8.0 kt
ANSWER: C
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Q003: At 0945 you take a bearing of the outer breakwater lighthouse = 045° M.
The vessel’s heading is 090° M and variation is 16° E. What is the true bearing
(TB) to the lighthouse?
Options:
A. 045° T
B. 061° T
C. 119° T
D. 135° T
ANSWER: C
Q004: The tide table for Seattle shows a +9.8 ft high at 0743 and a –1.5 ft low at
1406. What is the tidal range for this cycle?
Options:
A. 8.3 ft
B. 9.8 ft
C. 11.3 ft
D. 12.0 ft
ANSWER: C
Q005: You are entering a channel and observe a red-and-green horizontally-banded
buoy. What is the appropriate lateral aid interpretation for this buoy?
Options:
A. Preferred-channel side—leave to port when north-bound
B. Preferred-channel side—leave to starboard when north-bound
C. Junction or bifurcation—consult chart for preferred channel
D. Isolated danger—keep 100 m clear
ANSWER: C
ASA 105 Actual Exam Questions and
Answers with Rationales 2026/2027 |
Version 1 | Coastal Navigation
Certification | Pass Guarantee
Q001: While plotting a fix on NOAA Chart 18465, you note that your GPS
position is 47° 18.25' N, 122° 51.60' W. The nearest sounding is 18 ft. If the
charted datum is MLLW and the tide is +7.2 ft, what is the actual water depth at
this time?
Options:
A. 11.2 ft
B. 18.0 ft
C. 25.2 ft
D. 32.4 ft
ANSWER: C
Q002: Your dead-reckoning (DR) track from buoy “R ‘2’” to waypoint “B” is 185°
T at 6.0 kt. A 1.8 kt ebb current sets 340° T. What is the estimated SOG (speed
over ground) once the current is applied?
Options:
A. 4.2 kt
B. 5.4 kt
C. 7.2 kt
D. 8.0 kt
ANSWER: C
, 2
Q003: At 0945 you take a bearing of the outer breakwater lighthouse = 045° M.
The vessel’s heading is 090° M and variation is 16° E. What is the true bearing
(TB) to the lighthouse?
Options:
A. 045° T
B. 061° T
C. 119° T
D. 135° T
ANSWER: C
Q004: The tide table for Seattle shows a +9.8 ft high at 0743 and a –1.5 ft low at
1406. What is the tidal range for this cycle?
Options:
A. 8.3 ft
B. 9.8 ft
C. 11.3 ft
D. 12.0 ft
ANSWER: C
Q005: You are entering a channel and observe a red-and-green horizontally-banded
buoy. What is the appropriate lateral aid interpretation for this buoy?
Options:
A. Preferred-channel side—leave to port when north-bound
B. Preferred-channel side—leave to starboard when north-bound
C. Junction or bifurcation—consult chart for preferred channel
D. Isolated danger—keep 100 m clear
ANSWER: C
