Yachtmaster revision module 10 of 20
Course shaping, course to steer, visual and electronic fixes, DR/EP, and waypoint strategies.
13 guided lessons · 23 practice questions · 19 flashcards
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Chartwork is the practical skill of plotting courses, shaping a passage, fixing positions, and solving navigational problems on a nautical chart. At Yachtmaster Offshore level the problem...
Dead Reckoning (DR) is the process of estimating your position based solely on your course steered and distance run through the water — without accounting for tidal stream or leeway. It g...
A fix is a position determined from observations — it is more reliable than a DR or EP. Common methods include: visual bearings (take compass bearings of two or three charted objects and...
A running fix allows you to fix your position using a single landmark observed at two different times. You take a bearing of the landmark, continue on your course, and then take a second...
The course to steer is the compass course you need to follow to make good a desired ground track, after allowing for tidal stream, leeway, and compass errors. It involves constructing a v...
On longer passages the tidal stream changes direction and rate each hour. At Yachtmaster level you must construct a multi-hour CTS by stacking tidal vectors end-to-end for the passage dur...
Assume a required ground track of 090°T for two hours, a boat speed of 6 kn through the water, and a steady tidal stream setting 180°T at 2 kn. Ignore leeway for this training example. Th...
Start from a fix at 50°00.0′N 001°00.0′W. Steer 090°T at 6 kn for two hours, with no leeway: the DR displacement is 12 NM east. At latitude 50°N, one minute of longitude spans approximate...
A waypoint is a position defined by latitude and longitude, used to mark turning points or destinations on a passage. Modern GPS and chart plotters navigate between waypoints and display...
Leeway is the sideways drift caused by wind pushing the boat off course. A yacht sailing in strong winds will make leeway — the boat slides sideways to leeward. The amount depends on wind...
A clearing bearing is a pre-plotted compass bearing of a charted object that defines a safe boundary. As long as your observed bearing of that object stays on the safe side of the clearin...
Chartwork at Yachtmaster level is not just recall. The answer has to show command judgement, evidence quality, margin, and a fallback if the first plan stops being safe.
Decision pressure: The tidal gate creates a latest safe time, so a slow correction can invalidate the whole passage plan.
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