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ACTIVE SONAR USAGE
SeaBat T-Series Subsea Operator's Manual Page 42 January 31, 2019
Version 7
6.2.10.2 Depth Gate Tilt
Depth Gate Tilt is a feature that allows the operator to manually specify a tilt value for absolute
gates. Tilted depth gates are beneficial when it is desirable to concentrate bottom detect
operation efforts, e.g. on a sloping seafloor (see
Figure 13 ).
For instructions on how to adjust this setting, refer to the RESON Sonar UI User Manual ( see
Appendix E Reference Documentation ).
Manual gates with 0° tilt on a sloping seafloor Manual gates with -15° tilt on a sloping seafloor
Figure 13: Depth Gate Tilt
6.3 Enhancing System Efficiency
6.3.1 Multi-Detect Operation 9
Use of the Multi-detect feature is of great value in various applications both in terms of generated
result and safety:

Harbor surveys: safer detection

Offshore and renewables: robust cable
catenary determination

Marine research: fish school detection

Dredging: suspended sediment detection

Energy industry: submerged oil detection
Control the sensitivity of the Multi-detect feature with three controls:

Object Sensitivity: Increase to yield more detections on smaller objects; decrease to
yield fewer detections and only on larger objects.

Amplitude Sensitivity: Increase to cause more objects to be detected.

Max Detections: Up to 5 detections generated per beam, starting with the strongest
detection to the weakest detection.
NOTE
When the setting is 1, it returns the strongest detection, not the closest detection.
If the surveyor wants to find weaker detections in the water column (e.g. the mast
on a sunken ship), the detection setting should be >1.
9 Multi-detect is an optional add-on feature (see Table 1 ).
Figure 14: Submerged Oil
Detected by Multi-Detect