As Hakan says, the
Simrad, Lowrance, and
B&G branded radars (all made by Navico with different stickers) Halo and Halo+ are really easy to use with OpenCPN.
All you need is
power and a wired network port (it
might work over wifi, but the developers recommend a wired port). Without changing ANY settings, I have changed routers, and also plugged the Halo directly into my computer network port (no hub/router required) and each time, the
software "found" the radar and was able to display the radar information without any complicating re-configuration of IP addresses. Pretty magical.