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3.4.2 Deleting individual fish marks.........................................................................3-5
3.5 Relocating Fish School for Easy Observation ............................................................3-5
3.6 Event Mark, Own Ship Position Mark.........................................................................3-6
3.6.1 Event mark .....................................................................................................3-6
3.6.2 Entering an own ship position mark ...............................................................3-7
3.6.3 Deleting an event mark ..................................................................................3-7
3.7 Collectively Deleting Marks ........................................................................................3-7
3.8 Function Keys (F1-F4)................................................................................................3-8
3.8.1 Operating the function keys............................................................................3-8
3.8.2 Programming for fishing ground or target fish ................................................3-8
3.8.3 Programming specific function .......................................................................3-9
3.8.4 Confirming function key program ...................................................................3-9
3.9 Suppressing Effects of Pitching and Rolling (Stabilizer)...........................................3-10
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 .............................................................................4-5
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
8. MAINTENANCE, TROUBLESHOOTING ..............................................................8-1
8.1 General Maintenance .................................................................................................8-1
8.2 Cleaning the Equipment .............................................................................................8-1
8.3 Hull Unit Maintenance ................................................................................................8-2
8.3.1 Lubrication points, zinc plate ..........................................................................8-2
8.3.2 Manually raising the transducer .....................................................................8-3
8.4 Fuse Replacement .....................................................................................................8-4
8.5 Fan Replacement .......................................................................................................8-4
8.6 Troubleshooting..........................................................................................................8-5
8.7 Error Messages ..........................................................................................................8-6
8.8 Diagnostic Tests.........................................................................................................8-7
8.8.1 Choosing a diagnostic test .............................................................................8-7
8.8.2 Description of diagnostic tests........................................................................8-8