User's Manual

Smart Systems User’s Manual Version 1.1
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6.2.3 Section A – Position Information
The very top section (Section A) contains horizontal spatial positioning information in
feet or metres depending on the position units setting (see Section 6.3.1).
6.2.4 Section B - Data Display
This section contains the actual data collected or replayed. The section also contains the
depth indicator lines and any fiducial markers the user enters. See the sections below for
more details.
If a GPS receiver is attached to the DVL, a file containing GPS information can be saved
(see Section 6.3.5).
Depth Lines
Depth lines are horizontal lines indicating the estimated depth. They are very useful for
getting depth estimates to features of interest in the data.
The Depth Lines are controlled by the current velocity value as well as the depth
selected. See Section 6.3.1 on changing the depth setting and for more details on how
depths are determined.
To display the correct depth, it is the responsibility of the user to calibrate the
system to the correct velocity of the material (see Section 6.2.8 on how to
calibrate the system). Once a velocity value has been determined see Section
6.3.1 on how to change the velocity setting.
Note that it is possible to change the depth units between metres and feet (see Section
6.3.1).
Fiducial Markers
A fiducial marker is a dotted vertical line placed on the data section at a specific position
during data acquisition. Adding these markers during data acquisition is useful for
recording significant positions or the positions of surface objects encountered during the
survey.
A fiducial marker is activated by pressing the A button on the keypad during data
acquisition. As well, when using the backup arrow (Section 6.2.7) fiducial markers can
be added at the current arrow location by pressing the A button.
Smart Handle systems: On Smart Handle systems, it is also possible to add a fiducial
marker by quickly pressing the button on the Smart Handle during data acquisition.
The position and name of the object encountered at each marker can be recorded in a
field notebook. The fiducial marker is written to the trace header of the next trace to be
collected. Fiducial markers are numbered sequentially (F1, F2 etc.). When the data are
transferred to a PC and reviewed, these markers can assist with data interpretation.