Visual Aids to Navigation

Lighthouses, beacons, and light characteristics used for navigation.

Lighthouses and beaconsLight characteristicsNominal, geographical, and luminous rangeRising and dipping distances

8 guided lessons · 20 practice questions · 16 flashcards

3 outcomes · self-guided revision

Classify an observed aid as identified, provisional or not identified by combining its expected bearing, structure, colour, rhythm, period and independent position evidence.
Decode fixed, flashing, isophase, occulting, quick, very quick, grouped and long-flash characters, then measure an observed period without confusing group count, flash length and cycle time.
Decode character, colour, period, elevation and nominal range in order, then state which observations and limitations the charted description does not supply.

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