One prolonged blast at intervals of not more than two minutes is the signal … Three short blasts tell other boaters "I am backing up (operating astern propulsion)." One short blast (1 second) of the horn or whistle will show an intention to direct course of vessel to own starboard (right). Two whistle blasts indicate that the lifeguard has made the decision that he needs to … There are other whistle codes for other things as well, such as a single long blast for a train coming to a stop, two long blasts for the train moving forward, three long blasts for the train reversing, and repeated short blasts as a warning for those that may be on the tracks away from a … What does this signal mean?A) The vessel intends to leave you on her starboard side B) The vessel is altering course to port C) The vessel is altering course to starboard D) The vessel intends to leave you on her port side Whistle sound signals at sea come in two varieties, according to the International Regulations for Preventing Collisions at Sea (IRPCS): a short blast and a prolonged blast used for maneuvering and warning.. International and Inland are different. Whistle signal Verbal command . Two short blasts tell other boaters "I intend to pass you on my right (starboard) side." International is shown below. Two short blasts will show intention to direct course of vessel to own port (left). A short blast of a horn or whistle lasts about 1 second. Two blasts: "Archers to the shooting line" Meaning - pick up bow and move into position on the shooting line (keep arrows in quiver). Upon hearing the one- or two-blast signal of the other, the vessel must, if in agreement, sound the same whistle signal and take the steps necessary to ensure a safe passing. One short blast means a vessel is moving to starboard, two short blasts indicate a move to port and three short blasts denote a ship is moving backwards. 2.Two shorts horns: Train is ready to depart from the station. The short blast means a blast of about one second’s duration, while a prolonged blast is four to six seconds long. Three short blasts will indicate the vessel's engines are going astern (in reverse). 1. Prolonged blasts of a horn every 2 minutes mean when boating in foggy that there is a power driven vessel underway. A prolonged blast, which is a warning to all vessels that a ship is rounding a blind corner, is 4 to 6 seconds. The guard could also be letting you know that you are breaking a rule. Three blasts: "Walk forward and retrieve your arrows" One blast: "Begin shooting" Meaning - archers may now take the arrows out of the quivers and begin shooting. Inland is (i) shall indicate that maneuver by the following signals on her whistle: one short blast to mean “I intend to leave you on my port side”; two short blasts to mean “I intend to leave you on my starboard side”; and three short blasts to mean “I am operating astern propulsion”. The one- and two-short-blast signals in the Inland Rules signify an intention of passage with one other vessel. Restricted Visibility. One short horn: It means that the train is reached in the yard and is ready for regular cleaning. INTERNATIONAL ONLY You are in sight of a power-driven vessel that sounds two short blasts of the whistle.