JW Fishers SSS-100K PC Operation And Maintenance Manual page 29

Bottom Tracking
The Bottom Tracking tool calculates the depth of water beneath the
towfish. When Bottom tracking is active the Towfish Altitude is displayed to the
right of the "Standard Toolbar". If the towfish is the proper distance from the bot-
tom, the Towfish Altitude text is green. If the towfish is not the proper distance
from the bottom, the Towfish Altitude text is red.
Bottom Tracking Instructions:
1. Select: Action Menu -> Track Bottom.
2. Select Channel to Track.
3. Check "Draw Bottom Tracking Line" to draw a bottom tracking line on image.
a. Select Line color.
4. The "Threshold" control (0-100%) determines the minimum intensity signal
used to calculate the bottom return. 20% is a good starting point.
5. "Blanking Distance" sets the point which Sonar View starts looking for the
bottom return. This skips past transducer transmitting, propeller wash, and
close surface returns. 2 meters is a good starting point.
6. The "Duration" sets the number of consecutive pulses above the "Threshold"
value to determine the bottom return. 10 is a good starting point.
7. "Averaging (Number of pings)" determines the number of pings averaged
together to determine the bottom return. 20 is a good starting point.
Bottom Tracking Window
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