During pile driving

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Protecting underwater turbines

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Exclusion from Oil spillage

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Mammal Mitigation Device (MMD) - Specification




The marine mammal mitigation device (MMD) has been specifically designed for use in marine mammal exclusion applications.

A wide variety of transducers can be used tailored to the species being excluded, and the exclusion distances required: 

Transducer Output in rms Frequency Spectrum Sonar activation Radio activation & data Picture
Standard 195dbre1upa@1m 10kHz - 20kHz Yes Yes
Flood Ring 190dbre1upa@1m 1kHz - 4kHz Yes Yes
Omni directional 201dbre1upa@1m 10kHz - 30kHz Yes Yes

Operator's control: 

Frequency range & Volume 1,2, 4, 6 simultaneous sounds Sound length Sound varieties Species Picture
Random or manual Yes Random or manual Random or manual seals, dolphins, mid frequency whales
Random or manual Yes Random or manual Random or manual seals, dolphins, low frequency whales
Random or manual Yes Random or manual Random or manual seals, dolphins, mid frequency whales