Imagine this
You are preparing a real trip and lighthouses and beacons changes the decision. Use this module to explain the cue, the risk, and the next safe action before you move on.
6 lesson sections · 15 quiz questions · 10 flashcards
Day Skipper training module 12 of 17
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Visual Aids to Navigation
Lighthouses, beacons, and light characteristics used for navigation.
Lighthouses and beaconsLight characteristics
3 outcomes for this module
- Explain lighthouses, beacons, and light characteristics used for navigation.
- Apply Lighthouses and beacons to a realistic onboard situation.
- Recall the core check: lighthouses and lit marks help fix position, especially at night.
Preview the onboard scenario
You are preparing a real trip and lighthouses and beacons changes the decision. Use this module to explain the cue, the risk, and the next safe action before you move on.
6 lesson sections · 15 quiz questions · 10 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.
Why Visual Aids Matter
Visual aids to navigation — lighthouses, beacons, light vessels, and lit buoys — are essential for safe navigation, especially at night and in poor visibility. Understanding light charact...
- Lighthouses and lit marks help fix position, especially at night
- Each light has a unique characteristic (colour, pattern, period)
Light Characteristics
Every navigational light has a defined character: the repeated pattern of light and dark that lets you identify it from a chart or the Admiralty List of Lights. The most common chart abbr...
- F = Fixed (continuous light)
- Fl = Flashing (flash shorter than dark)
Reading Light Descriptions on Charts
On a chart, a light is described in a standard format, e.g., 'Fl(2) WR 10s 15m 12M'. This reads: Group flashing (2 flashes), White and Red sectors, period 10 seconds, height 15 metres abo...
- Chart format: Character Colour Period Height Range
- Example: Fl(2) WR 10s 15m 12M
Light Sectors
Many navigation lights show different colours in different directions, called sectors. Sector lights help vessels follow a safe approach line or keep clear of dangers. A white sector ofte...
- White sector often = safe channel
- Red/Green sectors often = warning of danger or channel limits
Lighthouses and Other Structures
Lighthouses are the most prominent visual aids. Each has a unique combination of colour scheme (daymark), light character, and sometimes a fog signal. They are charted with a star symbol...
- Lighthouses: unique daymark + light character + fog signal
- Beacons: fixed structures, may be lit or unlit
Fog Signals
Some lighthouses and navigation marks have fog signals — sound signals activated in poor visibility. These include diaphones (two-tone), sirens, horns, and bells. The character of the fog...
- Fog signals: diaphones, sirens, horns, bells
- Character shown on chart (e.g., Horn(2) 30s)
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