vgl->realtime_track_pt1_gc = vik_viewport_new_gc ( vp, "red", 2 );
vgl->realtime_track_pt2_gc = vik_viewport_new_gc ( vp, "green", 2 );
vgl->realtime_track_pt_gc = vgl->realtime_track_pt1_gc;
vgl->realtime_track_pt1_gc = vik_viewport_new_gc ( vp, "red", 2 );
vgl->realtime_track_pt2_gc = vik_viewport_new_gc ( vp, "green", 2 );
vgl->realtime_track_pt_gc = vgl->realtime_track_pt1_gc;