iv
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