Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Object Genres (hierarchy name)
4. object genres (object classifications)
5. [object genres by function]

Narrower term/s

• beacons [NP][+]
  • aeronautical beacons [+]
    • airport beacons
    • airway beacons
    • landmark beacons
    • obstruction beacons
  • lighthouse lamps
  • lightships [NP]
• lighthouses [NP]
• navigational instruments [NP][+]
  • compasses (direction indicators) [NP] [+]
    • mariners' compasses
    • surveyors' compasses
    • sun compasses
    • star compasses [+]
      • kāpehu whetū
    • luopans (feng shui tools)
  • gyrocompasses [NP]
  • sextants [NP]
  • alidades
  • sounding devices
  • [temporary alphabetical list: navigational instruments] [+]
    • beacon receivers
    • aircraft beacons
    • compass gimbals
    • course correctors
    • distance finders
    • driftsights
    • echometers
    • direction finders
    • global positioning receivers
    • foghorns
    • horizon glass shades
    • index shades
    • height-range indicators
    • log reels
    • loran receivers
    • mariner's astrolabes
    • palinurus
    • peloruses
    • navigational equipment [+]
      • navigational instrument cases
      • navigational markers
      • navigational scales
      • navigational telescopes [NP]
      • navigator's boards
    • nocturnals
    • octant cases
    • oscillometers
    • reflecting circles
    • position indicators
    • quadrant telescopes
    • radar antennas
    • radar receivers
    • radio compasses
    • radio direction finders
    • tracking receivers
    • sceptre recorders
    • sextant cases
    • sextant shades
    • sextant telescopes
    • wrist compass
    • sondographs
    • sounding leads
    • sounding tubes
    • spherographs
    • yaw meters
    • zenometers
    • star finders
    • station pointers
    • telltale compasses
• buoys [NP][+]
  • mooring buoys
• light stations [NP]

Anotations

Scope note:

Man-made objects such as buoys, lighthouses, lightships, Loran and other electronic systems, which aid mariners in determing position of safe course.