Thread reopened - just to note thanks for all the ideas & comments. Latest implemented idea is using a highly accurate magnetic model of earth (from NOAA) for more precise true/mag tracks, good worldwide not just in Aus.
At the moment the mag/true tracks are good for your current position & may be inaccurate at waypoints hundreds of miles ahead. These will come good as you get closer to them, however in v2.7.2 (eta 1 week after v2.7.1) we've made it so these report correct headings in the planning phase (as they should have, apologies). Remember "not for air navigation" as its not a million dollar TSO'd piece of equipment.