5.5.5 Minimum Range Gate (m)
This provides a means to block out noise or interference close to the sonar head. Enter the range, in
metres, from the sonar head to establish the gate; anything within that range will be blocked. As a
safety precaution: This gate should not be used when working in very shallow water.
5.5.6 Bottom Sampling
There are two main options: Equiangular or Equidistant. The equiangular and equidistant modes are
further enhanced by the Dual/Quad mode, described below. In equidistant mode, all beams are
equally distributed, within the sector. There are limits to what the equidistant can do, based on
opening angle and bottom topography; it is best on flat sea floor and with an opening angle (Sector
Coverage) equal to, or less than, 130°.
Figure 44: Bottom Sampling Modes
5.5.6.1 Dual/Quad Mode
The Dual/Quad bottom sampling modes can be used with both equiangular and equidistant
sampling. The modes work by spatially distributing the acrosstrack bottom sampling, ping by ping.
The beam is slightly repositioned, in the acrosstrack direction, with each ping. This mode was
developed for ROV/AUV survey operations.
The Dual/Quad mode will work at all speeds; however, it is at slower speeds, that the Dual or Quad
modes will be more evident.
The Dual/Quad mode requires 16-May-2013 head firmware and 17-Oct-2013 GUI or more recent.
All firmware from the current, Head$16-may-2013-03-58-29 will have this feature available. All
GUIs, from 17Oct2013 and newer will support the Dual/Quad mode.
Page 53 of 210
Version 5.0 Rev r002
Date 05-08-2014
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