From Elite Wiki
Waypoint class is an
Entity representing a waypoint added by System.setWaypoint(). It has all the properties and methods of an Entity, and several others.
This property was added in Oolite test release 1.79.
beaconCode : String (read/write)
The beacon code of the waypoint. The first character is used for identification on the Advanced Space Compass.
beaconLabel : String (read/write)
A full label for the beacon. This is useful where the beacon code and the full beacon label do not begin with the same letter.
size : Number (read/write)
The size of the waypoint in metres.