ASA 105 Exam V1 (Latest 2026/2027 Update) Questions & Answers| Grade A| 100% Correct (Verified Solutions) 2026/2027 | Page 1 | Passing Score: 80%
AMERICAN SAILING ASSOCIATION
ASA 105 Exam V1 (Latest 2026/2027 Update)
Questions & Answers| Grade A| 100% Correct
2026/2027 Edition - Official Exam 2026/2027
75 80% N/A
QUESTIONS PASSING SCORE RECERTIFICATION
Section 1 Nautical Charts and Publications (Q1-Q15) 15 questions
Section 2 Plotting and Position Fixing (Q16-Q30) 15 questions
Section 3 Tides and Currents (Q31-Q45) 15 questions
Section 4 Navigation Instruments and Electronics (Q46-Q60) 15 questions
Section 5 Route Planning and Safety (Q61-Q75) 15 questions
Exam Instructions
1. This exam contains 75 multiple-choice questions across 5 sections.
2. Select the single best answer for each question.
3. A passing score of 80% (60 correct answers) is required.
4. There is no time limit for completion.
5. Correct answers and rationales are provided after each question.
6. Review all rationales to strengthen understanding of coastal navigation.
ASA 105 Coastal Navigation Exam V1 - 2026/2027 | Passing Score: 80% | Page 1 of 41
, SECTION 1 Nautical Charts and Publications | Q1-Q15 | ASA 105 Coastal Navigation Exam V1 2026/2027
Question 1 of 75
1. A navigator is reviewing a nautical chart and notices a small circle with a dot in the center at a coastal
position. The abbreviation near this symbol indicates a charted feature that is visible at all stages of the
tide. The navigator needs to determine what this specific chart symbol represents for passage planning.
A. A rock that is above water at all tidal stages, shown by the dot within the circle
B. A buoy marking a submerged obstruction in the vicinity
C. A lighthouse with a fixed light characteristic shown on the chart
D. A depth sounding that has been verified by recent survey
Correct: A - On NOAA nautical charts, a small circle with a dot in the center represents a rock that is always above water. The
dot distinguishes it from a circle without a dot, which would indicate a rock that covers and uncovers. Buoys,
lighthouses, and depth soundings each have their own distinct chart symbols.
Question 2 of 75
2. A sailor is comparing two nautical charts covering the same coastal area. One chart has a scale of
1:20,000 and the other has a scale of 1:80,000. The sailor needs to understand the practical difference
between these scales when selecting a chart for close coastal navigation near harbor approaches.
A. Both charts provide the same level of detail since they cover the same area
B. The 1:20,000 chart provides significantly greater detail and is more suitable for close coastal navigation
C. The 1:80,000 chart is better for harbor approaches because it shows a wider area
D. Chart scale has no effect on the level of detail shown for navigation
Correct: B - A chart with a smaller scale denominator such as 1:20,000 is a large-scale chart that shows greater detail and is
more suitable for close coastal navigation and harbor approaches. A 1:80,000 chart is a small-scale chart better
suited for overview planning. Chart scale directly affects the level of detail presented.
ASA 105 Coastal Navigation Exam V1 - 2026/2027 | Passing Score: 80% | Page 2 of 41
, Question 3 of 75
3. A navigator notices that depths on a NOAA chart are referenced to Mean Lower Low Water and wonders
why this specific datum is used instead of Mean Sea Level. The navigator must understand how this datum
choice affects the interpretation of charted depths during voyage planning.
A. MLLW is used because it matches the datum used by GPS receivers for position fixing
B. MLLW is used because it provides the shallowest reference and ensures depths are conservative
C. MLLW ensures that actual water depth is typically greater than the charted depth, providing a safety margin for navigators
D. MLLW is used because it is the easiest tidal datum to calculate from tide gauge data
Correct: C - NOAA uses MLLW as the chart datum because it is a conservative reference point where actual water depth is
usually greater than charted depth. This gives navigators a built-in safety margin since the water will most often be
deeper than what is shown on the chart. MLLW is not related to GPS datum selection or ease of calculation.
Question 4 of 75
4. A navigator is examining the compass rose printed on a nautical chart and observes two concentric
rings with degree markings. The outer ring is labeled with true directions and the inner ring with magnetic
directions. The navigator must determine the correct way to use each ring for plotting courses on the
chart.
A. Both rings can be used interchangeably since they show the same directional information
B. The inner ring should always be used because magnetic directions are more practical for steering
C. The outer ring is only for decorative purposes and should not be used for navigation
D. The outer ring shows true north for plotting on the chart and the inner ring shows magnetic north with the local variation appli
Correct: D - The outer ring of the compass rose shows true north directions used for plotting courses on the chart, while the
inner ring shows magnetic north directions with the local variation already applied. Navigators use the outer ring for
true bearings and courses, and the inner ring as a quick reference for magnetic directions. The two rings serve
distinct purposes.
ASA 105 Coastal Navigation Exam V1 - 2026/2027 | Passing Score: 80% | Page 3 of 41
, Question 5 of 75
5. A coastal navigator is planning a voyage along an unfamiliar section of coastline and wants to
supplement the limited information shown on nautical charts. The navigator needs to identify the best
NOAA publication that provides detailed coastal descriptions, navigation notes, and local regulations not
found on charts.
A. The United States Coast Pilot provides detailed descriptive information that supplements nautical charts for coastal navigatio
B. The Light List provides the most comprehensive coastal descriptions and navigation notes available
C. The Notice to Mariners contains all necessary coastal navigation information for voyage planning
D. The Tide Tables offer complete coastal descriptions and local regulation summaries
Correct: A - The United States Coast Pilot is the NOAA publication specifically designed to supplement nautical charts with
detailed coastal descriptions, navigation notes, harbor information, and local regulations. The Light List focuses on
aids to navigation, Notice to Mariners provides chart corrections, and Tide Tables contain tidal predictions rather
than coastal descriptions.
Question 6 of 75
6. A sailor is trying to identify a light characteristic described as Fl R 4s 12ft 4M in a navigation reference.
The sailor must correctly interpret each component of this standard notation to identify the aid during a
night approach and confirm the vessel position along the coast.
A. Fixed red light that shines continuously, with a 4-second period and 12-foot tower
B. Flashing red light with a period of 4 seconds, focal plane 12 feet above datum, and nominal range of 4 nautical miles
C. Flashing red light that flashes 4 times per minute with a 12-mile range visible for 4 seconds
D. Alternating red light with 4-second interval, 12-meter tower height, and 4-mile luminous range
Correct: B - The standard light notation Fl R 4s 12ft 4M decodes as follows: Fl means flashing, R means red, 4s means the
period between flashes is 4 seconds, 12ft is the height of the focal plane above datum, and 4M is the nominal range
in nautical miles. Each element has a specific meaning in the standard NOAA format.
ASA 105 Coastal Navigation Exam V1 - 2026/2027 | Passing Score: 80% | Page 4 of 41
AMERICAN SAILING ASSOCIATION
ASA 105 Exam V1 (Latest 2026/2027 Update)
Questions & Answers| Grade A| 100% Correct
2026/2027 Edition - Official Exam 2026/2027
75 80% N/A
QUESTIONS PASSING SCORE RECERTIFICATION
Section 1 Nautical Charts and Publications (Q1-Q15) 15 questions
Section 2 Plotting and Position Fixing (Q16-Q30) 15 questions
Section 3 Tides and Currents (Q31-Q45) 15 questions
Section 4 Navigation Instruments and Electronics (Q46-Q60) 15 questions
Section 5 Route Planning and Safety (Q61-Q75) 15 questions
Exam Instructions
1. This exam contains 75 multiple-choice questions across 5 sections.
2. Select the single best answer for each question.
3. A passing score of 80% (60 correct answers) is required.
4. There is no time limit for completion.
5. Correct answers and rationales are provided after each question.
6. Review all rationales to strengthen understanding of coastal navigation.
ASA 105 Coastal Navigation Exam V1 - 2026/2027 | Passing Score: 80% | Page 1 of 41
, SECTION 1 Nautical Charts and Publications | Q1-Q15 | ASA 105 Coastal Navigation Exam V1 2026/2027
Question 1 of 75
1. A navigator is reviewing a nautical chart and notices a small circle with a dot in the center at a coastal
position. The abbreviation near this symbol indicates a charted feature that is visible at all stages of the
tide. The navigator needs to determine what this specific chart symbol represents for passage planning.
A. A rock that is above water at all tidal stages, shown by the dot within the circle
B. A buoy marking a submerged obstruction in the vicinity
C. A lighthouse with a fixed light characteristic shown on the chart
D. A depth sounding that has been verified by recent survey
Correct: A - On NOAA nautical charts, a small circle with a dot in the center represents a rock that is always above water. The
dot distinguishes it from a circle without a dot, which would indicate a rock that covers and uncovers. Buoys,
lighthouses, and depth soundings each have their own distinct chart symbols.
Question 2 of 75
2. A sailor is comparing two nautical charts covering the same coastal area. One chart has a scale of
1:20,000 and the other has a scale of 1:80,000. The sailor needs to understand the practical difference
between these scales when selecting a chart for close coastal navigation near harbor approaches.
A. Both charts provide the same level of detail since they cover the same area
B. The 1:20,000 chart provides significantly greater detail and is more suitable for close coastal navigation
C. The 1:80,000 chart is better for harbor approaches because it shows a wider area
D. Chart scale has no effect on the level of detail shown for navigation
Correct: B - A chart with a smaller scale denominator such as 1:20,000 is a large-scale chart that shows greater detail and is
more suitable for close coastal navigation and harbor approaches. A 1:80,000 chart is a small-scale chart better
suited for overview planning. Chart scale directly affects the level of detail presented.
ASA 105 Coastal Navigation Exam V1 - 2026/2027 | Passing Score: 80% | Page 2 of 41
, Question 3 of 75
3. A navigator notices that depths on a NOAA chart are referenced to Mean Lower Low Water and wonders
why this specific datum is used instead of Mean Sea Level. The navigator must understand how this datum
choice affects the interpretation of charted depths during voyage planning.
A. MLLW is used because it matches the datum used by GPS receivers for position fixing
B. MLLW is used because it provides the shallowest reference and ensures depths are conservative
C. MLLW ensures that actual water depth is typically greater than the charted depth, providing a safety margin for navigators
D. MLLW is used because it is the easiest tidal datum to calculate from tide gauge data
Correct: C - NOAA uses MLLW as the chart datum because it is a conservative reference point where actual water depth is
usually greater than charted depth. This gives navigators a built-in safety margin since the water will most often be
deeper than what is shown on the chart. MLLW is not related to GPS datum selection or ease of calculation.
Question 4 of 75
4. A navigator is examining the compass rose printed on a nautical chart and observes two concentric
rings with degree markings. The outer ring is labeled with true directions and the inner ring with magnetic
directions. The navigator must determine the correct way to use each ring for plotting courses on the
chart.
A. Both rings can be used interchangeably since they show the same directional information
B. The inner ring should always be used because magnetic directions are more practical for steering
C. The outer ring is only for decorative purposes and should not be used for navigation
D. The outer ring shows true north for plotting on the chart and the inner ring shows magnetic north with the local variation appli
Correct: D - The outer ring of the compass rose shows true north directions used for plotting courses on the chart, while the
inner ring shows magnetic north directions with the local variation already applied. Navigators use the outer ring for
true bearings and courses, and the inner ring as a quick reference for magnetic directions. The two rings serve
distinct purposes.
ASA 105 Coastal Navigation Exam V1 - 2026/2027 | Passing Score: 80% | Page 3 of 41
, Question 5 of 75
5. A coastal navigator is planning a voyage along an unfamiliar section of coastline and wants to
supplement the limited information shown on nautical charts. The navigator needs to identify the best
NOAA publication that provides detailed coastal descriptions, navigation notes, and local regulations not
found on charts.
A. The United States Coast Pilot provides detailed descriptive information that supplements nautical charts for coastal navigatio
B. The Light List provides the most comprehensive coastal descriptions and navigation notes available
C. The Notice to Mariners contains all necessary coastal navigation information for voyage planning
D. The Tide Tables offer complete coastal descriptions and local regulation summaries
Correct: A - The United States Coast Pilot is the NOAA publication specifically designed to supplement nautical charts with
detailed coastal descriptions, navigation notes, harbor information, and local regulations. The Light List focuses on
aids to navigation, Notice to Mariners provides chart corrections, and Tide Tables contain tidal predictions rather
than coastal descriptions.
Question 6 of 75
6. A sailor is trying to identify a light characteristic described as Fl R 4s 12ft 4M in a navigation reference.
The sailor must correctly interpret each component of this standard notation to identify the aid during a
night approach and confirm the vessel position along the coast.
A. Fixed red light that shines continuously, with a 4-second period and 12-foot tower
B. Flashing red light with a period of 4 seconds, focal plane 12 feet above datum, and nominal range of 4 nautical miles
C. Flashing red light that flashes 4 times per minute with a 12-mile range visible for 4 seconds
D. Alternating red light with 4-second interval, 12-meter tower height, and 4-mile luminous range
Correct: B - The standard light notation Fl R 4s 12ft 4M decodes as follows: Fl means flashing, R means red, 4s means the
period between flashes is 4 seconds, 12ft is the height of the focal plane above datum, and 4M is the nominal range
in nautical miles. Each element has a specific meaning in the standard NOAA format.
ASA 105 Coastal Navigation Exam V1 - 2026/2027 | Passing Score: 80% | Page 4 of 41
