When cruising or delivering the boat we carry a removable radar.  We have a modified car that just slides up the spinnaker pole track, and carries the radar scanner.  The wire pulls up the mast on a leader and exits near the scanner.

The scanner is mounted on the car so that the edge of the scanner just touches the pole track.  The scanner has to be rotated a bit so that the cable gland is out of the way.  It is easy to configure the software to handle the twisted installation so that straight ahead on the boat is straight up on the display.

The radar display is on a pivot hear the companionway, so that the radar display can be pivoted to be viewable from either on deck or below.

When racing everything comes off, the scanner, display, and cable.