Celestial Navigation website: Has history information and other links.

Celestial Navigation website: Originates from math department of the National University of Singapore. Includes information on instruments, with links to other sites.

Nautical Almanac On-Line: Includes many years of nautical almanacs and provides a star finder.

Navigation in the days of John Cabot: Shows navigational instruments of the 16th century, as used in voyages to Newfoundland by John Cabot.