Thanks for the link.
I read it as if you chose pyrotechnics as your visual distress signal for night, you need 3. But if you chose an electric one, then having a single device meets the requirement.
from page 18:
If pyrotechnic devices are selected, a minimum of three signals are required for day use and three signals for night use. Some pyrotechnic signals meet both day and night use requirements (combination flares)
Kayak & Canoe Outriggers
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