HEATKEYS

The Great Circle Mapper displays maps and computes distances along a geodesic path. It includes an extensive, searchable database of airports and other locations.

CSGNetwork Free Information. Calculators, Converters, Glossary, Open Source Code... find something. Most pages require JavaScript.

ProMar Software develops navigation and celestial software for the professional mariner

Maryland Nautical Sales is an international chart agent stocking worldwide nautical charts British Admiralty, NOAA, NIMA, Canadian, Oceangrafix, Imray nautical books, navigation instruments, etc.

Cruisers Forum is an online forum community of cruisers from around the world!

Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

MarineWaypoints.com is your guide to boats, boating, diving, fishing, gear, marine books, marine life, safety, sailing, watersports, weather and much more.

This site provides access to spreadsheets programmed for quick and accurate processing of data commonly acquired in celestial navigation.

THE starting place for exploring Geography, from your About.com expert Guide to geography. Learn about all concepts of geography, find geographic information, maps, and more. Includes geographic information about every country and state as well as ...

The Museum of HP Calculators displays and describes older Hewlett-Packard calculators. There are also sections on calculating machines and slide rules as well as sections for buying and selling HP calculators, an HP timeline, collecting informatio...

This application is a set of map drawing tools. One tool shows the shortest distance between two points, and the other tool shows the area within a given distance of a point.

MathWorks is the world’s leading developer of technical computing software for engineers and scientists in industry, government, and education