I installed the radar display for Journey On hanging underneath the overhead shelf. It doesn't interfere with the view out of the windows, and there is a lot of real estate under that shelf. As a matter of fact, I installed the depth sounder next to the radar, in the centre, and the VHF radio went on the port side of the shelf. Not only does this give a clear LOS, but it also allows Judy to have a good view of the instruments, and she's the radio operator. It's hard sometimes to steer the boat, and monitor the instruments at the same time. This allow the nut behind the wheel to do the steering and the "other person" to do the instrument monitoring. Just like in the movies.
Use the same bracket that came with the instrument, and turn it upside down. Bolt it through, cause you'll hit a few waves. I also put a 12 V terminal srtrip up there to minimize the wires. Also, you can coil up the excess radar cable and throw it on the top shelf. Worked out great.
Boris