USCG Exam PracticeLight List, ranges, and light characteristics
A mariner reads a Light List entry showing the characteristic simply as 'Fl 6s' with no colour designation. What colour is this light?
- A. Green, because green is the default for channel lights
- B. The colour cannot be determined without consulting the chart
- ✓ White, because white is the default colour and is omitted from the characteristic stringCorrect
- D. Red, because red is the most common single-flash light colour
Why C is correct
The Light List convention states that white is the default light colour and is omitted from the characteristic string. When no colour letter appears after the characteristic abbreviation, the light is white. Any other colour — red, green, etc. — would be explicitly stated.