SAMM
User Manual
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translational and rotational offsets associated with the sonar, navigation, and heading sensors
(Figure 15).
Figure 15. Survey Setup Panel
The fields are defined as follows.
Antenna offset: the distance of the GPS receiver antenna from a reference point in
common with the sonar head offset. The numbering convention is:
X = Port / Starboard (positive number = starboard, negative number = port).
Y = Fore / Aft (positive number = fore, negative number = aft).
Z = Height (positive number = above reference point, negative number = below
reference point).
Sonar head offset: the distance of the sonar head from a reference point in common with
the antenna offset. The same numbering convention is used as for the antenna offset.
Sonar heading offset: the sonar mount bias, i.e., the angular difference between the
centerline of the boat and the actual pointing direction of the sonar.
Pitch and roll offsets:
The pitch and roll offsets are not relevant to 2D imaging sonar, and
as such are not yet available.
Compass bias: the heading source mount bias, i.e. the difference between the reported
pointing direction of the heading source and the actual pointing direction of the heading
source. If you have a magnetic compass and know the declination (the difference
between north and magnetic north) for the survey, add it to this bias field.
(Automatic
magnetic declination based on lon/lat is not available at this time.)
Vessel: the shape, width, and length of your vessel. These fields define how the vessel
outline is drawn in the mosaic window.
SAMM draws the vessel, GPS antenna and sonar head in the mosaic window in reference to
the center of the boat. Please note that the antenna and sonar head crosshairs will be
incorrectly placed in relation to the vessel outline if you choose to use the location of either the
GPS unit or the sonar head as the reference point. The mosaic is otherwise unaffected. The unit
of measure for the x, y, and z offsets must match the unit for distance and vertical distance in
the Display subpanel of the Configuration window (see Section 4.2.3).
4.2
Display Tab
Display tab contains General, Swath colormap, and Units of measure panels.
4.2.1 General
The General panel in the Display tab in the Configuration window allows the user to change UI
appearance between normal and dark UI mode (Figure 16).
