You can change various preferences for the plugin.

The preferences dialog can be reached via OpenCPN Options > Plugins > Radar > Preferences or via the PPI menu Advanced > Preferences.

It looks like this:

You can choose Nautical Miles, Mixed or Kilometers. Not all radars support all types, in which case this setting will not change the reported settings.

You can choose between two types of drawing the picture; Vertex Array and Shader. Depending on the hardware and OS it is possible that one performs better than the other. Shader will perform the same regardless of how "busy" the radar picture is, whereas Vertex Array will use more CPU when there is more to draw. Also, Shader draws a little more "soft" image on most devices.

If you have a small display, or just prefer it that way, you can make the Control Menu dialog disappear automatically if you are not using it. You then need to access it by pressing the Menu area on the PPI window or via the Context menu (right mouse button.)

Depending on the colors and transparency it can be hard to see where the guard zones are. Change the styling of the guard zones to fix this.

If you don’t like the woman’s voice announcing a guard zone, you can change the alert sound, as well as the repetition time of such alarms when they are not confirmed.

You can change the color palette for Target trails, Targets, and the Radar PPI window background and AIS targets.

You can choose whether to:

You can choose the following display options:

And lastly, you can re-select your radar types.

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