What information can a map tell us? How can you use a map to determine the length of a trip? Objective Students will be able to: • Identify different types of maps and the kinds of information they contain • Locate Fort Clatsop on a map handout • Find a route from Portland, Oregon or their town to Fort Clatsop. Background Most of the route traveled by the members of the Corps of Discovery had not been mapped before and was completely new to them. Because Captain William Clark had surveying experience, he was the mapmaker of the group. He used his skills to create detailed maps of all the terri Duration: 60 Minutes.