Raymarine e7 User Reference page 171

Function
Sea Clutter Curve
Scanner Speed
Advanced Set-up
Using radar
Description
This menu item allows you to adjust the Sea Clutter — radar echoes from waves
can make it difficult to detect real targets. These echoes are known as "sea clutter".
Several factors can affect the level of clutter you see, including the weather and
sea conditions, and the mounting height of the radar. The sea clutter curve setting
adjusts the radar's sensitivity to sea clutter. The steepest setting for the curve is
1, and the most shallow setting is 8.
SuperHD open array radars with software version 3.23 or above or HD digital
radomes support multiple scan speeds:
• 24 RPM
• 48 RPM
This menu item contains a sub-menu that enables you to adjust the following
options:
• Bearing Alignment
• Display Timing
• Main Bang Suppression
• Tune Preset
• STC Preset— Non-HD Digital radomes only
• Reset Advanced
Options
• Adjust Curve (1 to 8)
Scanner Speed
• 24 RPM
• Auto — his option automatically
switches between the 24 RPM and 48
RPM scan speeds as appropriate.
Bearing Alignment
• -180º — 179.5º
Display Timing
• 0.415 n m — selected range
Main Bang Suppression
• On
• Off
Tune Preset
• 0 — 255
STC Preset
• 0 — 100%
Reset Advanced
• Yes
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