OCEAN 100 SDSU Lab Practical Exam - Fall 2025
Questions and Answers
Section 1: Navigation and Mapping (Questions 1-20)
1. What is the primary function of latitude lines on a nautical chart?
a) To indicate east-west direction
b) To measure north-south distance from the equator
c) To show depth contours
d) To mark magnetic variation
Answer: b)
2. Longitude lines converge at which points on Earth?
a) Equator
b) Tropics
c) Poles
d) Prime Meridian
Answer: c)
3. On a Mercator projection map, what distortion occurs near the poles?
a) Shapes are accurate
b) Areas are exaggerated
c) Distances are shortened
, d) Directions are curved
Answer: b)
4. A bathymetric contour line of 200 meters indicates:
a) Sea surface height
b) Ocean depth
c) Elevation above sea level
d) Current speed
Answer: b)
5. What tool is used to measure the distance between two points on a nautical chart?
a) Dividers
b) Compass rose
c) Sounding line
d) Sextant
Answer: a)
6. The Prime Meridian is defined as 0°:
a) Latitude
b) Longitude
c) Declination
c) Inclination
, Answer: b)
7. In navigation, "great circle" routes are:
a) Shortest paths over Earth's surface
b) Along latitude lines
c) Rhumb lines
d) Equatorial paths
Answer: a)
8. Magnetic declination is the difference between:
a) True north and magnetic north
b) Latitude and longitude
c) Chart north and grid north
d) Solar time and standard time
Answer: a)
9. A scale of 1:50,000 on a chart means 1 unit on the map equals:
a) 50,000 units on the ground
b) 50 units on the ground
c) 5,000 units on the ground
d) 500,000 units on the ground
Answer: a)
, 10. What does a dashed line on a nautical chart typically represent?
a) Depth contour
b) Recommended track
c) Hazard boundary
d) Coastline
Answer: b)
11. Latitude is measured in:
a) Degrees north or south
b) Degrees east or west
c) Minutes of arc
d) Nautical miles
Answer: a)
12. The equator is at 0°:
a) Longitude
b) Latitude
c) Altitude
d) Azimuth
Answer: b)
13. In contour mapping, closely spaced lines indicate:
a) Gentle slope
Questions and Answers
Section 1: Navigation and Mapping (Questions 1-20)
1. What is the primary function of latitude lines on a nautical chart?
a) To indicate east-west direction
b) To measure north-south distance from the equator
c) To show depth contours
d) To mark magnetic variation
Answer: b)
2. Longitude lines converge at which points on Earth?
a) Equator
b) Tropics
c) Poles
d) Prime Meridian
Answer: c)
3. On a Mercator projection map, what distortion occurs near the poles?
a) Shapes are accurate
b) Areas are exaggerated
c) Distances are shortened
, d) Directions are curved
Answer: b)
4. A bathymetric contour line of 200 meters indicates:
a) Sea surface height
b) Ocean depth
c) Elevation above sea level
d) Current speed
Answer: b)
5. What tool is used to measure the distance between two points on a nautical chart?
a) Dividers
b) Compass rose
c) Sounding line
d) Sextant
Answer: a)
6. The Prime Meridian is defined as 0°:
a) Latitude
b) Longitude
c) Declination
c) Inclination
, Answer: b)
7. In navigation, "great circle" routes are:
a) Shortest paths over Earth's surface
b) Along latitude lines
c) Rhumb lines
d) Equatorial paths
Answer: a)
8. Magnetic declination is the difference between:
a) True north and magnetic north
b) Latitude and longitude
c) Chart north and grid north
d) Solar time and standard time
Answer: a)
9. A scale of 1:50,000 on a chart means 1 unit on the map equals:
a) 50,000 units on the ground
b) 50 units on the ground
c) 5,000 units on the ground
d) 500,000 units on the ground
Answer: a)
, 10. What does a dashed line on a nautical chart typically represent?
a) Depth contour
b) Recommended track
c) Hazard boundary
d) Coastline
Answer: b)
11. Latitude is measured in:
a) Degrees north or south
b) Degrees east or west
c) Minutes of arc
d) Nautical miles
Answer: a)
12. The equator is at 0°:
a) Longitude
b) Latitude
c) Altitude
d) Azimuth
Answer: b)
13. In contour mapping, closely spaced lines indicate:
a) Gentle slope
