Great Circle and Rhumb line routes

Celestial navigation. Take the sextant and shoot the Sun or the North Star.

Celestial navigation. Take the sextant and get your Line of Position.

Fix by two circles of position: vector solution.
Celestial navigation.

Variation for the current day.
Used in navigation with a magnetic compass.

For training or improving your skills with a sextant.

The Nautical Almanac in your smartphone or tablet