The tutorials are intended to compliment and expand on the AstroNav Manual.
The Celestial Navigation tutorial covers the theory/ general aspects of celestial navigation. The AstroNav Quick Start guide is useful for examples;
Using a Sextant Altitude
Sight Calculations and Obtaining a Position
Corrections to a Sextant Altitude
Nautical Almanac Information
Sailings (Plane/ Plain and Mercator
The complete Celestial Navigation tutorial in pdf format is available
The AstroNav Quick Start guide fleshes out examples in the tutorial by adding context and examples
The Celestial Navigation tutorial should be quickly browsed as a foundation for the AstroNav Quick Start.