Simrad SN90 Operator's Manual page 182

Simrad SN90 Operator Manual
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Coverage Plot
When you operate with sector transmissions, the area covered by the sonar beams is
limited by the chosen transmit sector angle. To make it easier to recognize the area
limits, dedicated border lines may be added to the presentation. These lines are used
to outline the sector. Use this function to toggle the coverage plot lines On or Off.
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