Sextants; telescopes; compasses for measuring; directional compasses; gps navigation device; magnetic compasses; magnetic compasses for surveying; surveying compass needles; surveying instruments; equatorial telescopes; meridian transit telescopes; reflecting telescopes; zenith telescopes

Sextants; Telescopes; Compasses for measuring; Directional compasses; GPS navigation device; Magnetic compasses; Magnetic compasses for surveying; Surveying compass needles; Surveying instruments; Equatorial telescopes; Meridian transit telescopes; Reflecting telescopes; Zenith telescopes