TABLE OF CONTENTS
vi
3.9.6 Echo average............................................................................................... 3-14
3.9.7 How to suppress sidelobes .......................................................................... 3-14
3.10 How to Adjust Beam Width ...................................................................................... 3-15
3.11 Other Menu Items .................................................................................................... 3-16
3.12 Application to Bonito and Tuna Fishing.................................................................... 3-17
3.12.1 Searching..................................................................................................... 3-17
3.12.2 Tracking ....................................................................................................... 3-17
3.12.3 Approaching................................................................................................. 3-18
3.12.4 Catching....................................................................................................... 3-18
4. SLANT MODE ........................................................................................................4-1
4.1 Basic Operating Procedure ........................................................................................ 4-1
4.2 Indications and Marks ................................................................................................ 4-2
4.2.1 Slant mode, full-screen display ...................................................................... 4-2
4.2.2 Slant mode, combination display ................................................................... 4-3
4.3 Display Range............................................................................................................ 4-4
4.4 Tilt Angle .................................................................................................................... 4-4
4.4.1 How to set the tilt angle.................................................................................. 4-4
4.4.2 Automatic tilt................................................................................................... 4-5
4.5 Auto Train...................................................................................................................4-6
4.6 How to Measure Range and Bearing to a Target.......................................................4-6
4.7 How to Eliminate Weak Echoes ................................................................................. 4-7
4.8 How to Adjust Strong, Weak Echoes ......................................................................... 4-8
4.8.1 AGC ............................................................................................................... 4-8
4.8.2 Near AGC....................................................................................................... 4-9
4.8.3 2nd AGC ........................................................................................................ 4-9
4.8.4 How to shorten pulse length.........................................................................4-10
4.9 How to Suppress Bottom and Sea Surface Reflections in Shallow Waters .............4-11
4.10 How to Reject Sonar Interference and Noise........................................................... 4-12
4.10.1 How to identify the noise source ..................................................................4-12
4.10.2 Change TX interval ......................................................................................4-13
4.10.3 Interference rejector..................................................................................... 4-13
4.10.4 Shift TX frequency........................................................................................ 4-14
4.10.5 Noise limiter ................................................................................................. 4-14
4.10.6 Reverberation...............................................................................................4-15
4.10.7 Echo average............................................................................................... 4-15
4.10.8 How to suppress sidelobes .......................................................................... 4-16
4.11 How to Adjust Beam Width ...................................................................................... 4-16
4.12 How to Track a School of Fish ................................................................................. 4-17
4.12.1 How to select the target lock mode.............................................................. 4-17
4.12.2 Fish mode .................................................................................................... 4-18
4.12.3 Target mark mode........................................................................................ 4-18
4.12.4 Target lock menu description....................................................................... 4-19
4.13 How to Detect Schools of Fish Aurally ..................................................................... 4-20
4.13.1 How to set the bearing ................................................................................. 4-20
4.13.2 How to select the audio sector..................................................................... 4-20
4.13.3 Reverberation for audio signal ..................................................................... 4-21
4.14 Fish Alarm ................................................................................................................ 4-21
4.15 How to Relocate a School of Fish ............................................................................ 4-22
4.15.1 Manual offcenter .......................................................................................... 4-22
4.15.2 Automatic offcenter ...................................................................................... 4-23
4.16 How to Compare Concentration of School of Fish ................................................... 4-24
4.16.1 How to compare with the fish estimate mark ............................................... 4-24
4.16.2 How to compare with the circle cursor ......................................................... 4-24
4.17 How to Measure the Speed of a School of Fish....................................................... 4-26
4.17.1 How to measure the speed of a school of fish ............................................. 4-26
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