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iii
INTERPRETING THE DISPLAY
Seabed Echoes .......................................................................................................................6-1
Fish Schools...........................................................................................................................6-2
Sea Surface Reflections .........................................................................................................6-3
Wake ......................................................................................................................................6-3
False Echo by Sidelobe..........................................................................................................6-4
Noise and Interference ...........................................................................................................6-4
MAINTENANCE
Display Unit Maintenance .....................................................................................................7-1
Hull Unit Maintenance ..........................................................................................................7-2
TROUBLESHOOTING
When the Transducer Cannot be Retracted ...........................................................................8-1
Diagnostic Tests.....................................................................................................................8-3
SPECIFICATIONS.......................................................................................................9-1