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Radar revision module 8 of 9

FOG

Restricted Visibility Radar

Radar use with COLREGs Rule 19 thinking, sound signals, speed, and lookout.

restricted visibilitysafe speed

4 guided lessons · 8 practice questions · 8 flashcards

3 outcomes · self-guided revision
  • Explain radar use with COLREGs Rule 19 thinking, sound signals, speed, and lookout.
  • Apply restricted visibility to a realistic onboard situation.
  • Recall the core check: use radar as one available means.

A self-guided revision companion that explains essential concepts, then helps you practise and test them. It supports—but does not replace—recognised instruction, practical training, assessment or certification. Access is a one-time payment, not a subscription.

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Lesson routeRadar in Fog Is Not a Permission Slip0/1 read

Lesson 1 of 1

Radar in Fog Is Not a Permission Slip

Radar is valuable in restricted visibility, but fitting radar does not make normal cruising speed safe. The skipper still needs proper lookout, safe speed, sound signals, lights, and early risk assessment.

The most dangerous error is thinking the screen has removed uncertainty. In fog, uncertainty is the operating condition.

  • Use radar as one available means.
  • Proceed at a safe speed for the conditions.
  • Post extra lookout where possible.
  • Use required sound signals and navigation lights.
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