@maritimemaster: Thick fog, nothing to see, and from somewhere you hear one prolonged blast followed by two short, so what is out there? This Rule 35 quiz plays four fog signals, three on the whistle and one on the bell, and shows how each rhythm narrows down what is hiding in the murk. Save it for your next foggy passage, because in fog your ears are part of your lookout. #colregs #fogsignals #seamanship #boating #learnontiktok