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The earth and charts — Navigation B — Instruments, Mashit 30

14 questions on the earth and charts, from the Navigation B — Instruments exam of Mashit 30. Latitude and longitude, the nautical mile and distances. Every question is shown with its correct answer, as in the official question pool.

Practise by topic · All 193 Navigation B — Instruments questions · Mock exam

Questions on The earth and charts

  1. Why is the earth's surface divided by meridians of longitude and parallels of latitude? To define positions where they intersect.
  2. Where should distances be measured on a Mercator chart? In units of latitude, on the scale at the left or right side of the chart, level with the area you are sailing in.
  3. A nautical mile is equal in length to: One minute of arc on a great circle.
  4. What is the length of one nautical mile? 1852.5 metres.
  5. On the geographic grid, how many whole degrees are there from the equator to each of the poles? 90° to the North Pole and 90° to the South Pole.
  6. The Greenwich meridian is: All of the above.
  7. Parallels of latitude on the earth are: Apart from the equator, small circles at right angles to the earth's axis of rotation, whose diameter decreases towards the poles.
  8. Meridians (lines of longitude) are: Great circles at right angles to the equator, passing through the poles.
  9. What is a rhumb line? Answers b and c are correct.
  10. What is the shortest route between the Strait of Gibraltar and New York City? An arc of the great circle that passes through the two places.
  11. What is the distance, in nautical miles, between two adjacent parallels of latitude on the earth's surface? 60 miles.
  12. Is the distance between two adjacent meridians on the earth's surface constant? No.
  13. Where does the parallel of latitude 20°N end? It does not end.
  14. Which meridian joins the meridian of 40°E to make a complete circle? 140°W.

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