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APPENDIX A — Technical specifications
PAGE 28
Table 8: 491 technical specifications (Continued)
Manual controls
Gain
Clutter
Signal level
Noise limiter
White level
Range
Advance speed
Depth units
Installation calibrations
0 to 75 dB
0 to 9
0 to 5
ON/OFF
Background color
up to 3500 feet (1000 meters)
1/8 to 2/1
Feet, meters, fathoms
Speed, temperature, gain, transducer depth/
offset
491 INSTALLATION MANUAL Revision A
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