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Time and time zones — Navigation B — Instruments, Mashit 30

10 questions on time and time zones, from the Navigation B — Instruments exam of Mashit 30. UTC, zone time, local time and the date line. Every question is shown with its correct answer, as in the official question pool.

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Questions on Time and time zones

  1. How is local time worked out? From the vessel's present longitude east or west of Greenwich.
  2. What does 'zone time' mean? The uniform time kept across a band of 15°, 7½° east and 7½° west of a central meridian.
  3. On 31 December you are on longitude 179°31'E and the time is 23:59. What are the time and date on longitude 179°31'W? 23:59 on 30 December.
  4. What does it mean when the zone time is said to be UTC+3? All of the above.
  5. The date on board is 24.06.11, the zone time is 10:42 and the observer's longitude is 154°39'E. What will the time and date be at Greenwich? The time will be 00:42 on 24.06.11.
  6. You are on the yacht MARNI, MMSI 428666099, lying at anchor off Haifa port in position 32°42'N 034°58'E. At midnight local time an unidentified vessel collides with your yacht. She is now lying over on her side and is in danger of sinking. There are 3 passengers and 3 crew on board. Your vessel is equipped to GMDSS requirements for sea area A1. Choose the correct statement: Send a distress call to all stations; send a DSC distress alert with the nature of distress COLLISION, and state on VHF that there are 6 people on board.
  7. Your position is 32°17'N 157°42'E and the time is 17:53 UTC. The zone time is therefore: 04:53
  8. Zone time (ZT) is defined as: The time in an area, set by its time zone.
  9. UTC is defined as: Coordinated Universal Time, equal to Greenwich Mean Time.
  10. What is local mean time? The time in an area according to the observer's meridian (longitude).

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