Freiberger Yacht Sextant

The Freiberger Yacht Sextant is a precision optical instrument designed specifically for yachtsmen and small-craft navigators. With a compact and lightweight construction, it offers all the advantages of traditional celestial navigation in a form tailored for limited onboard space.

The frame is made from a light yet rigid aluminium alloy that is both corrosion-resistant and well-balanced in hand. A clear view is ensured by large, high-quality horizon and index mirrors, tested for optical flatness and parallelism. The optical system includes a front-focusing telescope with 2.4x magnification and a 25 mm aperture. The rubber eyepiece sits comfortably against the face and remains stable during adjustment.

Brightness control is managed through swing-in graded filters – three on the index mirror and two on the horizon mirror – designed to offer equal luminosity of both images. These graded shades protect the eye while supporting accurate angle readings.

This sextant is a dependable navigation aid that operates without electronic input, unaffected by electromagnetic interference. It is inexpensive to run, straightforward to use, and engineered for longevity.

Features

• Safe, independent positioning system requiring no electrical power
• Large field of view with a clear image and stable eyepiece
• Accurate, easily readable angle measurements with fine graduations
• Swing-in filters for comfortable sighting and eye protection
• Lightweight aluminium frame with corrosion resistance
• Index arm protected between the handle and frame
• Includes high-quality wooden case, adjustment tool, test certificate, and user’s guide

Technical Data

• Graduated Arc
  Radius: 142 mm
  Scale: −3° to +123° (interval: 1°)
• Drum Graduations
  Interval: 1'
• Telescope
  Aperture: 25 mm
  Magnification: 2.4x
• Dimensions
  Sextant: 24 × 21 × 11 cm
  Carrying Case: 26.5 × 24 × 15 cm
• Weight
  Sextant: 0.86 kg
  Carrying Case: 2.8 kg
• Materials
  Frame: Aluminium alloy
  Handle: Plastic
  Colour: Black

About Freiberger

For more than 250 years, precision engineering and optical instruments have been developed in Freiberg, Germany. Today, FPM Holding GmbH (Freiberger Präzisionsmechanik) continues this tradition, manufacturing precision surveying and navigation instruments used in civil engineering, geodetics, and structural monitoring projects across the world.