References

Polaris Project - North Star (http://www.polaris.iastate.edu/NorthStar/)

Wikipedia (http://en.wikipedia.org/wiki/Latitude, http://en.wikipedia.org/wiki/Longitude, http://en.wikipedia.org/wiki/Compass_rose)

Perry-Castañeda Library - Map Collection (http://www.lib.utexas.edu/maps/world.html)