The ZÖLLNER ZETFON 300/310 – Electronic Horn with optional microphone unit is a type approved electronic ship horn and loud announcement system for marine use that produces a powerful horn signal in excess of 131 decibels for vessels up to 75 meters in length. The ZETFON 300/310 is a robust electrically operated whistle which is equally suitable for all types of inland and maritime navigation.
It also provides an optional microphone unit for communication between helm station and personnel on the exterior deck of the vessel. The ZETFON 300/310 consists of the following components:
Sample two is a video inside the sound laboratory:
This Zoellner ship horns for the High Seas and Inland shipping is built to the highest quality standards. It offers 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. The audio signals are tested and certified against 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
Ship length [m]: 20 - 75
Ship length [m]: 75 - 200
Ship length [m]: > 200
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