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1. OPERATIONAL OVERVIEW
1-24
1.14 Eliminating Weak Echoes
Sedimented water or reflections from plankton may be painted on the display in green or
light-blue. These weak echoes may be erased with the signal level function.
1. Click Settings.
2. Click Echo image.
3. Click ◄ or ► in the Signal level box to choose the echo strength you wish to erase. The
higher the number the stronger the echo that will be erased.
4. Click OK button.
1.15 Suppressing Unwanted Noise
Noise from other echo sounder or electrical interference may show itself on the screen. Use
the noise limiter to suppress unwanted noise.
Interference from
other sounder
Electrical interference
Examples of noise
1. Click Setting.
2. Click Echo image.
3. Click ▼ in the Noise limiter box.
Noise limiter options
4. Click the setting desired. The higher the number the greater the degree of suppression.
Choose OFF when no noise exists, so as not to miss small targets.
5. Click the OK button.