MKT 75/260 Air whistle, , suitable for vessels with a LOA 20m till 75m.

 

Regulations Before and After COLREG 1972

Before “COLREG 1972” (International Regulations for Preventing Collisions at Sea), low-pitched tones were often used for smaller vessels. However, the principle of reserving low tones for large vessels was not strictly enforced. The IMO regulations now reserve very low tones exclusively for the largest ships. For middle-sized and smaller vessels, there are broader frequency options available.

 

Signal Preferences and Frequency Range

IMO regulations prioritize signals that maintain audibility even at a distance. Vessels between 20 and 75 meters (66 – 246 feet) should use whistles with frequencies ranging between 250 and 700 Hz. These frequencies ensure effective communication and compliance with maritime safety standards.

 

Optimal Whistle Positioning for Clear Sound Propagation

Proper whistle positioning is essential for ensuring clear, unobstructed sound radiation. Large deck surfaces can disrupt sound waves, similar to how light waves experience optical refraction. This disruption can diminish the effectiveness of the whistle. To prevent such issues, it’s crucial to place the whistle where no obstacles interfere with sound propagation.
 

Meeting IMO Regulations for Safety

The International Maritime Organization (IMO) emphasizes the importance of selecting an appropriate whistle position on board. Not only does this ensure efficient signaling, but it also guarantees that the permissible sound levels at the listening post are maintained. Excessive noise at this post can be a safety concern, so careful placement is key.
 
For the best results, a combined whistle system should be used, featuring a frequency difference of at least 10 Hz between the two whistles. This setup complies with IMO safety regulations and enhances sound distribution across the vessel. Proper installation ensures both strong signaling and adherence to safety standards, protecting crew members from high noise levels while ensuring effective communication at sea.

 

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