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TABLE OF CONTENTS
FOREWORD ..................................................................................................................vii
SYSTEM CONFIGURATION ........................................................................................viii
1. OPERATIONAL OVERVIEW .................................................................................1-1
1.1 Control Unit ................................................................................................................ 1-1
1.2 Remote Controller (option)......................................................................................... 1-2
1.3 Basic Operating Procedure ........................................................................................1-3
1.3.1 Turning on the power ..................................................................................... 1-3
1.3.2 Lowering the transducer................................................................................. 1-3
1.3.3 Transmitting ...................................................................................................1-4
1.3.4 Adjusting backlighting of control unit.............................................................. 1-5
1.3.5 Choosing a display mode............................................................................... 1-6
1.3.6 Choosing the display range............................................................................ 1-8
1.3.7 Adjusting the gain........................................................................................... 1-9
1.3.8 Retracting the transducer, turning off the power............................................ 1-9
1.4 Setting the Tilt Angle................................................................................................ 1-10
1.4.1 Automatic tilt on/off....................................................................................... 1-10
1.4.2 Bottom and tilt angle .................................................................................... 1-11
1.4.3 How to discriminate fish echoes from the bottom ........................................ 1-11
1.4.4 Points to consider......................................................................................... 1-12
1.4.5 Tilt angle for surface fish..............................................................................1-12
1.4.6 Suitable tilt angle..........................................................................................1-13
1.5 Finding Range and Bearing to a Target ...................................................................1-14
1.6 Sonar Menu Overview..............................................................................................1-14
1.6.1 Operating procedure .................................................................................... 1-14
1.6.2 Sonar menu description ............................................................................... 1-16
2. FINE TUNING THE SONAR PICTURE..................................................................2-1
2.1 Eliminating Unwanted Echoes ...................................................................................2-1
2.2 Displaying Surface Fish Clearly .................................................................................2-2
2.3 Suppressing Bottom Tail............................................................................................2-2
2.3.1 AGC ............................................................................................................... 2-2
2.3.2 Pulse length ...................................................................................................2-3
2.3.3 2ND AGC ....................................................................................................... 2-3
2.4 Suppressing Bottom and Sea Surface Reflections in Shallow Fishing Grounds .......2-4
2.5 Rejecting Sonar Interference and Noise .................................................................... 2-5
2.5.1 Identifying noise source ................................................................................. 2-5
2.5.2 Rejecting noise with the interference rejector ................................................ 2-5
2.5.3 Rejecting noise with the noise limiter.............................................................2-5
2.5.4 Rejecting interference with TX cycle..............................................................2-6
2.6 Choosing Beamwidth ................................................................................................. 2-7
2.6.1 Horizontal beamwidth.....................................................................................2-7
2.6.2 Vertical beamwidth.........................................................................................2-7
2.7 Deleting Weak Echoes...............................................................................................2-7
2.8 Echo Averaging..........................................................................................................2-7
3. ADVANCED SONAR OPERATION.......................................................................3-1
3.1 Tracking a Fish School (target lock)........................................................................... 3-1
3.2 Detecting Fish Schools Aurally ..................................................................................3-2
3.3 The Fish Alarm...........................................................................................................3-3
3.4 Measuring Fish School Speed ................................................................................... 3-4
3.4.1 Entering a fish mark ....................................................................................... 3-4