The Columbus Navigation Homepage
- The history, navigation, and landfall of Christopher Columbus. Includes a timeline of the life and voyages of Columbus.
- http://www.columbusnavigation.com/

Wayfinding, or Non-Instrument Navigation
- How Polynesians navigated before the invention of the compass, sextant, or clock.
- http://pvs.kcc.hawaii.edu/L2wayfind.html

Longitude at Sea
- Describes 17th and 18th century use of eclipses of Jupiter's moons to identify position.
- http://galileo.rice.edu/sci/observations/longitude.html

Navigation Instruments
- Brief descriptions, thumbnails, links to other resources.
- http://beatl.barnard.columbia.edu/students/his3487/cantrell/presentation1.html

John Harrison and the Longitude Problem
- The problem, the man, the clocks and the prize. Online exhibit at Royal Observatory Greenwich.
- http://www.nmm.ac.uk/server.php?request=setTemplate:singlecontent&contentTypeA=conWebDoc&contentId=355&viewPage=1&navId=005001000002

Escape from Antarctica
- Recreates the navigation Ernest Shackleton's crew used on their voyage seeking rescue.
- http://www.pbs.org/wgbh/nova/shackleton/navigate/escape.html

Evolution of the Sextant
- Illustrated article including details about dating. Links to antique instruments offered for sale.
- http://www.westsea.com/tsg3/octlocker/octchart.htm

Medieval and Twentieth Century Navigation
- Methods and equipment used by Columbus and by the Apollo astronauts described, compared, and contrasted.
- http://www.jsc.nasa.gov/er/seh/navigate.htm

Understanding How Thompson Navigated
- About David Thompson's exploration of western Canada and the northwestern United States from 1790 to 1812, using a sextant and compass. From the Northwest Journal.
- http://www.northwestjournal.ca/dtnav.html

Secrets of Ancient Navigation
- An overview from the PBS show "The Search for Longitude".
- http://www.pbs.org/wgbh/nova/longitude/secrets.html

Traditional Navigation in the Western Pacific
- Covers the role, techniques, and tools of the Carolinian navigator. From the University of Pennsylvania Museum of Archaeology and Anthropology.
- http://www.museum.upenn.edu/navigation/Intro.html

The Seamans Secrets
- Text from a book originally printed in 1657 that discusses tides, declinations, and other marine navigation topics.
- http://www.mcallen.lib.tx.us/books/seasecr/dseasec1.htm

The History of the Sextant
- Transcript of a talk given at the Science Museum of The University of Coimbra. Includes photos of ancient devices.
- http://www.mat.uc.pt/~helios/Mestre/Novemb00/H61iflan.htm