Furuno fea2100 Benutzerhandbuch

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Radar Echo Overlay 
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Echo Stretch
Echo stretch is used to emphasise radar echo to increase detectability of targets.  Position LOW emphasise both
noise and target level echoes while position HIGH emphasise only target level echoes.
Echo stretch HIGH.
Echo stretch OFF.
Echo Overload situation
Improperly set radar GainSea clutter filter or Interference reject could lead to an overload situation, in which
you see visual distortion such as above in your screen.  Then check, if you have red text Overload, and adjust gain
or sea clutter filter and set Interference reject in High position.