3-23
3. Click the Towfish Control tab and select the range for each frequency. This tab is shown in FIGURE
3-14.
4. Click the Bottom Track tab on the Lower Control panel. This tab is shown in FIGURE 3-18.
Figure 3-18: Bottom Track Tab
5. On the Bottom Track tab make the required settings to track the bottom (check the TrackBottom
and Tracking Indicator boxes) and note the towfish altitude in the Altitude display. Refer to the
DISCOVER software manual for details on setting up bottom tracking.
6. Lower the towfish such that its altitude is 10–15% of the range selection.
7. Increase the survey vessel speed to the desired survey speed and adjust the amount of cable out
such that the altitude of the towfish remains at 10–15% of the range selection.
8. If a pressure sensor is installed, verify that the Pressure display indication is correct.
9. Secure the tow cable to the survey vessel.
10. Begin recording data.
3.14 Towfish Recovery
CAUTION! The following procedure is only meant as a general guide. Due
to varying condition, exact recovery methods will change and it is up to
the end user to modify their procedure to match the conditions they are
working under.
1. To recover the towfish:
2. Slowly pull in the tow cable until the towfish is just below the surface.
3. Slow the survey vessel speed to under two knots, or, if practical, put the survey vessel in neutral
while the towfish is brought on board.
4. Retrieve the towfish from the water and carefully lower it on deck.
5. Set the Power switch to the OFF position.
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