Furuno FEA-2807 - Transparency; Operational Differences between ECDIS Only Mode and Modes with Radar Overlay

23. Radar Overlay
23-6
• Adjust controls (gain, sea clutter, rain clutter, interference rejector, etc) on the radar to obtain proper radar
image.
• On the radar overlay dialog box, do the following:
a) Set IR to IR1.
b) Adjust the Gain control to properly set the gain.
Note: The condition of the radar echo changes with adjustment of range, etc. on the radar. When the overload
condition occurs, adjust the gain on the radar to obtain proper picture.
Adjust Gain.
Set IR to IR1.
23.4.7 Transparency
Transparency controls "see through" behavior of the radar overlay. The option "Opaque" superimposes radar echoes
on the chart display without modifying their color. "25%" displays radar echoes somewhat faintly, and "75%"
displays radar echoes very faintly. It is recommended to use 25% or 50% when navigating narrow channels, so as
not to conceal landmasses.
23.5 Operational Differences Between ECDIS only
Mode and Modes with Radar Overlay
There are some operational differences between ECDIS only mode and modes with Radar Overlay.
• Scale indication in nautical miles when using Radar Overlay
• Scale maximum with Radar Overlay video is 24 NM