OpenCPN/OpenCPN — pull request #212 by jongough (2014-12-05 21:49:11+00:00)
Title: Draw range rings on waypoints

Selection of number and spacing of rings is in Options/Ship
Display of range rings is by waypoint and is selected via waypoint properties
State of waypoint range rings is saved in navobj.xml as new extended opencpn attribute "waypoint_range_rings"