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TABLE OF CONTENTS
vii
3. VERTICAL MODE..........................................................................................3-1
3.1 Basic Operating Procedure ...................................................................................3-1
3.2 Vertical Mode Concept...........................................................................................3-2
3.2.1 Overview......................................................................................................3-2
3.2.2 Setting the vertical display ...........................................................................3-2
3.3 Vertical Mode Indications and Marks.....................................................................3-3
3.3.1 Typical vertical display .................................................................................3-3
3.3.2 Vertical bearing mark, tilt mark.....................................................................3-4
3.3.3 Trackball mark position reference mark........................................................3-5
3.4 Auto Train...............................................................................................................3-5
3.5 Display Range........................................................................................................3-6
3.6 Measuring the Range ............................................................................................3-6
3.7 Eliminating Weak Echoes......................................................................................3-7
3.8 Suppressing Bottom Tail......................................................................................3-10
3.8.1 Adjust AGC................................................................................................3-10
3.8.2 Decrease pulse length ...............................................................................3-10
3.8.3 Adjust 2
nd
AGC........................................................................................... 3-11
3.8.4 Adjust Near AGC........................................................................................ 3-11
3.9 Rejecting Interference and Noise........................................................................3-12
3.9.1 Identifying noise source .............................................................................3-12
3.9.2 Interference rejector...................................................................................3-12
3.9.3 Noise limiter...............................................................................................3-13
3.9.4 Shifting Tx frequency .................................................................................3-13
3.9.5 Echo average.............................................................................................3-13
3.9.6 Reverberation reduction.............................................................................3-13
3.9.7 Suppressing gain of bottom echo...............................................................3-14
3.9.8 Suppressing sidelobes...............................................................................3-14
3.10 Adjusting Beamwidth ...........................................................................................3-15
3.11 Vertical Expansion Display ..................................................................................3-16
3.12 OTHERS Menu ....................................................................................................3-17
3.12.1 Displaying the OTHERS menu.................................................................3-17
3.12.2 OTHERS menu description......................................................................3-18
3.13 Application to Bonito and Tuna Fishing...............................................................3-21
3.13.1 Searching.................................................................................................3-21
3.13.2 Tracking...................................................................................................3-21
3.13.3 Approaching.............................................................................................3-21
3.13.4 Catching...................................................................................................3-22
4. SLANT MODE................................................................................................4-1
4.1 Basic Operating Procedure ...................................................................................4-1
4.2 Indications and Marks............................................................................................4-2
4.2.1 Slant mode single display ............................................................................4-2
4.2.2 Slant mode combination display...................................................................4-3
4.3 Display Range........................................................................................................4-7
4.4 Tilt Angle.................................................................................................................4-8
4.4.1 Setting the tilt angle .....................................................................................4-8
4.4.2 Automatic tilt ................................................................................................4-9
4.5 Auto Training........................................................................................................4-11