IV.10.4Acoustic seabed survey equipment

b. Acoustic transmitting and receiving systems or arrays, designed for object detection or location, having any of the following: 1. A transmitting frequency below 10 kHz;2. Sound pressure level exceeding 224 dB (reference 1 μPa at 1 m) for equipment with an operating frequency in the band from 10 kHz to 24 kHz inclusive; 3. Sound pressure level exceeding 235 dB (reference 1 μPa at 1 m) for equipment with an operating frequency in the band between 24 kHz and 30 kHz; 4. Forming beams of less than 1° on any axis and having an operating frequency of less than 100 kHz; 5. Designed to operate with an unambiguous display range exceeding 5.120 m; 6. Designed to withstand pressure during normal operation at depths exceeding 1.000 m and having transducers with any of the following: a. Dynamic compensation for pressure; b. Incorporating a transduction element other than lead zirconate titanate (PZT).