PBS.org
https://www.pbs.org/gunsgermssteel/
The PBS website for the 2005 miniseries based on the Guns, Germs, and Steel provides a number of handy resources including links to the episodes, transcripts of each episode, and a long list of related reading materials.
searoutes.com
Searoutes.com is a free professional navigation resource that allows users to plot nautical routes, check weather forecasts along routes, and include or avoid roads and/or rivers.
Google Earth
Google Earth is a resource which...