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