+gdouble *vik_track_make_distance_map ( const VikTrack *tr, guint16 num_chunks );
+gdouble *vik_track_make_elevation_time_map ( const VikTrack *tr, guint16 num_chunks );
+gdouble *vik_track_make_speed_dist_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);
+
+void vik_track_apply_dem_data ( VikTrack *tr);
+/*
+ * Apply DEM data (if available) - to only the last trackpoint
+ */
+void vik_track_apply_dem_data_last_trackpoint ( VikTrack *tr );
+
+/* appends t2 to t1, leaving t2 with no trackpoints */
+void vik_track_steal_and_append_trackpoints ( VikTrack *t1, VikTrack *t2 );
+
+/* starting at the end, looks backwards for the last "double point", a duplicate trackpoint.
+ * If there is no double point, deletes all the trackpoints.
+ * Returns the new end of the track (or the start if there are no double points
+ */
+VikCoord *vik_track_cut_back_to_double_point ( VikTrack *tr );