All of our ship horns for the High Seas, Inland shipping and Leisure markets are built to the highest quality standards. They offer owners and captains a highly reliable means of meeting IMO/USCG tone signalling requirements and an aesthetically pleasing element on board with a distinctive sound that will be the envy of everyone. With a worldwide reputation for durability, distinctive sound and exceptional finish, our ship horns can be found on most commercial vessels and mega yachts in the world. All audio signals are tested and certified in an in-house laboratory to ensure compliance with the standards set by the International Maritime Organization (IMO) and the Collision Regulations (COLREG).
The "Convention on the International Regulations for Preventing Collisions at Sea (COLREG, 1972 - Annex III) describes the technical details of sound signal appliances with respect to the sound signal intensity and the range of the audibility (see: COLREGS - International Regulations for Preventing Collisions at Sea; Annex Ill - Technical Details of Sound Signal Appliances; Chapter 1. Whistles (check IMO for latest version!)
Ship length [m]: < 20: measured Frequencies [Hz]: 180 - 450, 450 - 800; 800 - 2100; Sound pressure @ 1m [dB(SPL)]: 120; 115; 111; Range [NM]: 0,5
Ship length [m]: 20 - 75: measured Frequencies [Hz]: 250-700; Sound pressure @ 1m [dB(SPL)]: 130; Range [NM]: 1
Ship length [m]: 75 - 200: measured Frequencies [Hz]: 130-350; Sound pressure @ 1m [dB(SPL)]: 138; Range [NM]: 1,5
Ship length [m]: > 200: measured Frequencies [Hz]: 70-200; Sound pressure @ 1m [dB(SPL)]: 143; Range [NM]: 2
