What immediate action should you take when operating a boat if you hear a fog singal?

Who owns the Yuko yacht? What does a cruise ship refit mean? What is the part of a vessel is used for steering? What must be displayed on each side on the bow of a registered vessel? What is 83 ez go fuel mixture? Does the word boat have a long or short vowel sound? Do you need a passport to take a cruise to cozumel? Does any cruise require a passport? What is the name of Henry hudsons boat? What does a green can-shaped buoy? What does 5 short blast of a horn mean when boating? What bad things can happen while you're on a sailing boat? What is the oil fuel mixture for a 105 hp Chrysler outboard motor? When did bartholomew diaz sail? What is proper fuel to oil ratio for Evinrude Model 15504C? How much does it cost to replace a circulating pump in a new water heater? What immediate action should you take when you hear the fog signal of another boat you cannot see? Inboard gasoline boats built after July 31st 1981 must have what kind of ventilation system? Is the bore of a cylinder the circumference? Meaning of cruise tourism?