Kongsberg M3 Sonar, Reference Manual

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Filters
You can apply an averaging, background removal, or an edge enhancement filter to the
sonar view.
Note
You can adjust the strength of these filters in the
Display Widget
.
Average Filter
Clicking the “A” button will enable the Average Filter. This filter reduces noise.
Slow-moving features persist on-screen.
This filter averages the image from ping to ping so that slow-moving features will persist,
while reducing noise in the image. The Average Filter is especially useful when the image is
constructed from multiple pings.
Background Removal
Clicking the “B” button will enable the Background Removal filter. This filter removes
stationary parts of the background to enhance moving objects (such as fish, for example).
Edge Enhancement
Clicking the “E” button will enable Edge Enhancement. This filter enhances the edge of
moving features.
This filter provides some persistence for the image. Edge Enhancement is especially useful
when you wish to view a school of fish clearly, for example.
No Filter
Disables any filters. The sonar view will display an unfiltered sonar image.
No filtering is preferable if instantaneous readings are required, since this shortens the delay
between updating the changes in sonar data, and the corresponding displayed information.
Related topics
Applying filters, page 38
M3 Sonar FLS Reference Manual