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Jan 302012
All Safe and Sound
Sound Signals
Every vessel is required to carry some kind of efficient sound producing device to signal their intentions as outlined below.
Vessels are required to sound signals any time that they are in close quarters and risk of collision exists.
The term “short blast” means a blast of about one second.
The term “prolonged blast” means a blast of from four to six sconds.
The following signals are the only ones to be used to signal a vessel’s intentions ( inland rules only).
One short blast – I intend to change course to starboard.
Two short blasts – I intend to change course to port.
Three short blasts – I am operating astern propulsion (backing up).
Five or more short and rapid blasts – Danger or doubt signal (I don’t understand your intent).
Note: Inland rules use sound signals to indicate intent to maneuver and a response should be received. In international rules the signals are given when the maneuver is being executed.
Vessels indicate their intention to maneuver by using sound signals. If you do not agree with or understand clearly what the other vessel’s intentions are, you should sound the danger or doubt signal (5 short, rapid blasts). Each vessel should then slow or stop until signals for safe passing are sounded, understood and agreed to.
The danger or doubt signal can also be used to tell another vessel that its action is dangerous. If a boat is backing up into an obstruction you would sound the danger signal to warn the operator.
There are two sets of navigation rules; inland and international. A nautical chart will show you the demarcation lines where the rules change from international to inland and vice-verse. In general, these demarcation lines follow the coastline and cross inlets and bays. On the seaward side of the demarcation lines, international rules apply.
We will concentrate on the inland rules, since most of your recreational boating will occur on the landward side of the demarcation lines.
The Navigation Rules are written with the understanding that not all boats can maneuver with the same ease. Therefore, Rule 18 states that certain vessels must keep out of the way of other vessels due to their ability to maneuver.
A power driven vessel underway must keep out of the way of the following:
A sailing vessel, under sail only, and vessels propelled by oars or paddles. (Note: when a sailboat has its motor running, it is considered a power driven vessel.)
A vessel engaged in fishing, whose fishing equipment restricts its maneuverability. This does not include a sport fisher or party boat and generally means a commercial fishing vessel.
A vessel with restricted maneuverability such as a dredge or tow boat, a boat engaged in work that restricts it to a ce