track_angle             Track angle
track_bearing           Track bearing
track_bearing_to        Track bearing to location/s
track_distance          Track distance
track_distance_to       Track distance to location/s
track_grid              Track grid
track_intermediate      Track intermediate points
track_query             Query track data for arbitrary locations
track_speed             Track speed
track_time              Track time duration
track_turn              Track turn angle
trips0                  Simulated track data
