NOAA
Noaa: Make Your Own Compass [Pdf]
Build a compass to help you figure out which direction is north or south.
National High Magnetic Field Laboratory
Magnet Academy: Oersted's Compass 1820
Compasses had been steering people in the right direction for many centuries when, in the year 1820, one particular compass made a very different sort of revelation to an unsuspecting Danish science professor.
BBC
Bbc: Bitesize Geography: Os Map Skills
A short tutorial on mapping tools and how to read maps. Covers features of maps, symbols, the compass, scale, distance, how height is represented, and grid references. Includes multiple-choice quiz at the end.