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3.
ADVANCED SONAR OPERATION ...................................................................3-1
3.1 Tracking a Fish School (target lock)........................................................................... 3-1
3.2 Detecting Fish Schools Aurally .................................................................................. 3-3
3.3 The Fish Alarm .......................................................................................................... 3-4
3.4 Measuring Fish School Speed ................................................................................... 3-5
3.4.1 Entering a fish mark......................................................................................... 3-5
3.4.2 Deleting individual fish marks .......................................................................... 3-6
3.5 Relocating Fish School for Easy Observation ............................................................ 3-6
3.6 Event Mark, Own Ship Position Mark......................................................................... 3-7
3.6.1 Event mark ...................................................................................................... 3-7
3.6.2 Entering an own ship position mark ................................................................. 3-8
3.6.3 Deleting an event mark.................................................................................... 3-8
3.7 Collectively Deleting Marks........................................................................................ 3-9
3.8 Function Keys (F1-F4)............................................................................................. 3-10
3.8.1 Operating the function keys ........................................................................... 3-10
3.8.2 Programming for fishing ground or target fish ................................................ 3-10
3.8.3 Programming specific function....................................................................... 3-11
3.8.4 Confirming function key program ................................................................... 3-12
3.9 Suppressing Effects of Pitching and Rolling (Stabilizer) ........................................... 3-13
4.
ECHOSOUNDER MODE ...................................................................................4-1
4.1 Choosing the Range.................................................................................................. 4-1
4.2 Adjusting the Gain ..................................................................................................... 4-2
4.3 Picture Advance Speed.............................................................................................. 4-3
4.4 Measuring Depth ....................................................................................................... 4-3
4.5 Suppressing Interference........................................................................................... 4-4
4.6 Suppressing Low Level Noise.................................................................................... 4-4
4.7 Erasing Weak Echoes ............................................................................................... 4-5
4.8 Other Items on the Sounder Menu............................................................................. 4-6
5.
MARKS AND DATA ...........................................................................................5-1
5.1 Marks and Data on the Normal Display...................................................................... 5-1
5.2 Marks and Data on the Echosounder and Audio Displays.......................................... 5-5
6.
INTERPRETING THE DISPLAY ........................................................................6-1
6.1 Bottom Echo.............................................................................................................. 6-1
6.2 Fish School................................................................................................................ 6-2
6.3 Sea Surface Reflections ............................................................................................ 6-3
6.4 Wake ......................................................................................................................... 6-3
6.5 False Echo by Sidelobe ............................................................................................. 6-4
6.6 Noise and Interference .............................................................................................. 6-4
7.
MARKS AND SYSTEM MENUS ........................................................................7-1
7.1 MARKS Menu............................................................................................................ 7-1
7.2 SYSTEM Menu.......................................................................................................... 7-3