IYT theory · free

IYT Yachtmaster Ocean practice test: exam questions and theory

1000 questions in 10 topics. Each topic has an article that explains the rules the questions ask about, with drawings; the app asks the questions, explains every answer and brings your mistakes back until you get them right.

1000questions
10topics
50exam questions

The mock exam: 50 questions spread over every topic, 120 minutes, pass at 70 %. Size, time and pass mark are the app’s defaults, not an official rule.

Topics

  1. 1. The Earth, the celestial sphere & the PZX triangleCelestial navigation rests on one picture: the sky as a sphere round you, each body standing over one spot on the Earth. · 9 min read · 100 questions
  2. 2. The sextant & altitude correctionsA sextant reads the angle between a body and the horizon to a tenth of a minute, and a minute is a mile on the chart. · 8 min read · 100 questions
  3. 3. Measurement of timeEvery celestial fix is a time fix: four seconds of error are a mile of longitude. · 8 min read · 100 questions
  4. 4. Meridian altitudes & the pole starA body on your meridian gives latitude with one subtraction and no accurate time: the noon Sun by day, Polaris and the meridian stars at twilight. · 8 min read · 100 questions
  5. 5. Sun sightsA timed sun sight gives one position line. · 8 min read · 100 questions
  6. 6. Planets, moon & starsAt dawn and dusk the sky gives several position lines within minutes: a fix with no run in it. · 8 min read · 100 questions
  7. 7. Compass checking & satellite navigationMid-ocean there is no transit to check the compass against: you use the Sun and the stars. · 7 min read · 100 questions
  8. 8. Great circle sailingOn an ocean the straight line on your chart is not the shortest way. · 8 min read · 100 questions
  9. 9. Ocean meteorologyOcean routes follow the planet's wind belts. · 9 min read · 100 questions
  10. 10. Ocean passage planningAn ocean passage is won before the start: season, boat, crew. · 9 min read · 100 questions
Practise it

Practise by topic with the reason after every answer, take a timed mock exam, and see your progress per topic. Free, no sign-up, in the browser or in Telegram.

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