This text investigates the technical requirements for maintaining, calibrating, and operating a marine sextant for celestial navigation. Bruce A. Bauer provides a comprehensive manual for mariners, detailing the mechanical intricacies of the instrument and the historical context of its development. The work serves as both a practical guide for field repairs and a historical overview of the tool's evolution in maritime history.

Experts and maritime enthusiasts frequently cite this work as a standard reference for traditional navigation. Readers often note the technical clarity of the prose, which makes complex mechanical adjustments accessible to the average sailor.