Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by profession or discipline]
7. [equipment for transportation]

Additional parents:

1. top of the aat hierarchies
2. Objects Facet
3. Object Genres
4. object genres
5. object genres by function
6. aids to navigation

Narrower term/s

• compasses (direction indicators) [NP][+]
  • mariners' compasses
  • surveyors' compasses
  • sun compasses
• 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

Anotations

Scope note:

Various instruments, such as compasses, gyrocompasses, and sextants, that help navigators, usually in watercraft or aircraft, determine their position, course, and distance traveled.