+VikTrackpoint *vik_track_get_closest_tp_by_percentage_dist ( VikTrack *tr, gdouble reldist );
+gdouble *vik_track_make_speed_map ( const VikTrack *tr, guint16 num_chunks );
+gboolean vik_track_get_minmax_alt ( const VikTrack *tr, gdouble *min_alt, gdouble *max_alt );
+void vik_track_marshall ( VikTrack *tr, guint8 **data, guint *len);
+VikTrack *vik_track_unmarshall (guint8 *data, guint datalen);