USCG Exam Practice · Light List, ranges, and light characteristics
When a light characteristic string shows no colour abbreviation — for example, 'Fl 6s' — what colour is the light?
- AGreen, because green is the standard channel colour
- BThe colour cannot be determined without consulting the chart
- CWhite, because white is the default and is omitted from the characteristic string✓ correct
- DYellow, because yellow lights do not require a colour designator
Why C is correct
White is the default light colour and is omitted from the characteristic string. Any other colour — red, green, etc. — would be explicitly stated. Light List — light-characteristic (W).
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