Imagine this
You are preparing a real trip and precautions in fog changes the decision. Use this module to explain the cue, the risk, and the next safe action before you move on.
5 lesson sections · 12 quiz questions · 8 flashcards
Day Skipper training module 15 of 17
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Restricted Visibility
Precautions and limitations imposed by fog and restricted visibility.
Precautions in fogLimitations imposed by restricted visibility
3 outcomes for this module
- Explain precautions and limitations imposed by fog and restricted visibility.
- Apply Precautions in fog to a realistic onboard situation.
- Recall the core check: fog can arrive suddenly with little warning.
Preview the onboard scenario
You are preparing a real trip and precautions in fog changes the decision. Use this module to explain the cue, the risk, and the next safe action before you move on.
5 lesson sections · 12 quiz questions · 8 flashcards
Lesson summaries
Use this module hub to choose the right lesson, then open the dedicated lesson page for the complete explanation, worked examples, FAQs, and practice questions.
Navigating in Fog
Fog is one of the most dangerous conditions for small-craft sailors. Visibility can drop to metres with little warning. Your ability to see hazards, other vessels, and navigation marks is...
- Fog can arrive suddenly with little warning
- Consider postponing passage if fog is forecast
Precautions in Fog
Fix your position immediately while you can still see landmarks. Switch on navigation lights. Start sounding fog signals (one prolonged blast every two minutes for a power vessel, one pro...
- Fix position while you still can see marks
- Navigation lights ON
Fog Signals (Rule 35)
Rule 35 of the COLREGs specifies sound signals in restricted visibility. A power-driven vessel making way: one prolonged blast (4–6 seconds) every 2 minutes. A power-driven vessel stopped...
- Power vessel making way: 1 prolonged blast / 2 min
- Power vessel stopped: 2 prolonged blasts / 2 min
Using Instruments in Fog
Without visual references, you must rely on instruments. GPS provides your position — plot it on the chart regularly. The echo sounder gives depth — compare it with the chart to confirm y...
- GPS: plot position on chart regularly
- Echo sounder: compare depth with chart as a position check
Rule 19 — Conduct in Restricted Visibility
Rule 19 applies to vessels not in sight of one another in restricted visibility. The normal in-sight stand-on/give-way rules (Rules 12–18) do not apply when the vessels cannot see each ot...
- Rules 12–18 do NOT apply when vessels are not in sight of each other
- Rule 19 replaces them when vessels are not in sight
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