Great Circle and Rhumb line routes

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

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

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

For training or improving your skills with a sextant.

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

The Nautical Almanac in your smartphone or tablet