@rek @chainik Oh wow. This reference is cool - I had no idea any of these except O and Q existed. Never seen them (except Q, which I carried) on the water in WA or BC, and they're not taught as part of the semi-required boater's ed curriculum in WA (the only flags you get taught in that course are the red and white diver-down flag (not the A flag), and the 'murica flag being required on your stern if you leave US waters)