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Five short horn blasts from another boat on the water usually means danger. It could mean they have doubt in the message they had received from you, whether they did not hear it or did not understand. It can also be used to signal that the boat driver is confused about who has the right away. It is a signal to alert another vessel that you are unsure of its intentions, or doubt whether you are taking enough action to avoid a collision.
When two boats approach each other, they use horn blasts to signal the other about their intentions when it comes to moving to avoid collision. 5 short blasts indicates that the signaling boat is unsure about what the other boat is doing.
3 short blasts
3 short blasts
3
5 or more short blasts.....if you are taking the boating exam try typing the Arizona course boat ED after every question you type, in Google is what i used if your state is not Arizona then just type you state in.
3 short blasts
3 short blasts
passing on the port side from behind
three short blast
3 blasts on the horn says you are going astern
3 short blasts