USCG Exam PracticeLight List, ranges, and light characteristics
A light is charted with the characteristic string 'Iso 6s' with no colour designation. What colour is this light, and why?
- A. Red, because red is the default colour for Isophase lights
- ✓ White, because white is the default light colour and is omitted from the characteristic stringCorrect
- C. Green, because the absence of a colour code indicates a starboard-hand aid
- D. The colour cannot be determined without consulting the Light List directly
Why B is correct
White is the default light colour and is omitted from the characteristic string when the light is white. Therefore, 'Iso 6s' with no colour designation indicates a white Isophase light with a 6-second period.