YACHT-UNLIMITED-L2.3

Meteorology and ocean routeing for command

A Master routes the yacht around the world's weather, and command means making the seasonal and daily decisions that keep her out of danger. This lesson covers meteorology and ocean routeing at command level.

Routeing the yacht

  • Interpret synoptic charts, forecasts and professional weather-routeing advice for any ocean region.
  • Understand the global wind belts, the ocean currents, and the seasons and regions of the tropical revolving storms.
  • Plan seasonal routeing to avoid storm regions and heavy weather wherever possible.
  • Make the command decisions to divert, slow down or shelter based on the developing weather.

Worldwide command is largely seasonal planning: keeping the yacht out of the tropical-storm regions in their season and routeing with the climatology rather than against it, using the routeing charts and, increasingly, professional shore-based routeing advice. But the plan meets real weather, and the Master must be able to read a developing situation — a deepening low, an out-of-season disturbance, a forecast that has changed — and take the command decision to alter course, reduce speed, heave-to or run for shelter in good time rather than late.

WARNING — Season and region first Ocean command begins with seasonal planning: keep the yacht out of tropical-storm regions in their season and route with the climatology. No amount of good handling makes up for being in the wrong ocean at the wrong time of year.

TIP — Decide early on the developing picture Weather rewards the Master who acts on the trend, not the one who waits for certainty. A course alteration or a decision to shelter is far easier taken early than forced late in a rising sea.

Practice questions

5 questions
recallcore

recall · core

Worldwide ocean routeing for a large yacht is chiefly about: (a) Ignoring the season (b) Seasonal planning to avoid storm regions using climatology and routeing advice (c) The shortest great circle regardless of weather (d) Inshore tidal streams

recallcore

recall · core

Tropical revolving storms occur: (a) Anywhere, any time (b) In defined regions during defined seasons (c) Only at the poles (d) Only in harbour

recallcore

recall · core

Faced with a deepening low ahead, the Master should: (a) Hold course and hope (b) Take an early command decision to alter, slow, heave-to or shelter (c) Increase to full speed into it (d) Wait for certainty

recallcore

recall · core

Professional weather-routeing advice is used to: (a) Replace the Master's judgement (b) Inform the Master's routeing decisions alongside the forecasts (c) Steer the ship automatically (d) Set the safety contour

recallcore

recall · core

The great ocean currents are planned for because they: (a) Never change (b) Help or hinder the passage and steepen the sea against the wind (c) Only matter inshore (d) Affect the compass

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