Bearing (lower left corner on the map):
true north - indicates the bearing from the actual position to the next waypoint
Heading (lower right corner on the map):
magnetic north - as long as the flight speed is too low to identify a GPS track.
Heading (on the list of the waypoints, upper left corner):
HDG - magnetic north
Track (lower right corner on the map):
true north (direction over ground) - indicated instead of the heading if flying fast enough
Advanced route planning (on the list of the waypoints, upper left corner):
true north: indicated next to the map icon
magnetic north including the magnetic declination: indicated next to the plane icon