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Following this attack, the United States Navy established a requirement for an acoustic hailing device. The term acoustic hailing device came into common use following the suicide attack on the USS Cole while it was at port in Yemen in 2000. These devices are capable of being heard over 1.5 miles away from the emitter head.

Omnidirectional models: These acoustic hailing devices are capable of creating 360° voice communications and warning tones.

Their directionality is typically 5° to 60° radius conical at a 2 kHz tone.

Directional models: These AHDs are characterized by their ability to create long-range, directional voice communications and warning tones.

Consequently, as a general rule, higher source levels have greater range.Īcoustic hailing devices can come in two forms The sound level diminishes or attenuates with distance. The distance at which acoustic hailing can be effective varies based on several factors including the sound level, directionality, and frequency of the acoustic source, the sensitivity and directionality of the receiver, and the transmission channel environment. An omni-directional AHD on a concrete pad in AfghanistanĪcoustic hailing devices are acoustic devices capable of outputting highly intelligible sound at very high volumes.