3-10 CHAPTER 3 Preparation for Use
Series 3900 Sonar System Operations and Maintenance Manual 11214510, Rev. 02
3.5.3 At-Sea Test
To perform the at-sea test:
1. With the computer running and at the Windows desktop, turn on the TPU.
After the TPU boots (as in Step 3 above), start SonarPro. Again, check for the
output pulse, and then carefully deploy the towfish.
2. Adjust the towfish within the water column so that it is at a comfortable altitude
off the bottom and under the boat wake (about 15 percent of range). A good
starting vessel speed is around 4 or 5 knots. Check for the following:
• The image is satisfactory for both the 445-kHz and 900-kHz channels.
• Pitch, roll, depth, and altitude are being displayed.
• Speed and heading are being displayed from the GPS.
This completes the at-sea test.
CAUTION When the towfish is close to the sea floor, the 900-kHz
bottom tracking (altitude) performance is not exact. Klein Marine Systems,
Inc. advises extreme caution when operating the towfish at altitudes of less
than 4 meters (13 feet).
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