Device for navigation by stars.

a term used in reference to pipe organs and steam calliopes to indicate a mechanical linkage between keys or pedals pressed by the organist and the valve that allows air to flow into pipe(s) of the corresponding note.

Pointing device using rolling ball.

Indigenous tracker for Australian police.

Dog trained to follow scents.

Laser trackers are instruments that accurately measure large objects by determining the positions of optical targets held against those objects.

Investment fund mirroring specific index.

Rapidly progresses in career path.

Device that moves so as to aim a collector of solar energy at the sun as it crosses the sky

A barn door tracker, also known as a Haig or Scotch mount, is a device used to cancel out the diurnal motion of the Earth for the observation or photography of astronomical objects.