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For Lewis and Clark, as well as the explorers who followed them, one of their main tasks was to map an unknown territory. Maps would allow trappers, immigrants and settlers to find their way west. To draw the maps, Lewis and Clark had to figure out the longitude and latitude at each point, and they relied on the best technology available at the time:
• a sextant, which cost $77
• an octant
• an artificial horizon
• a surveying compass
• and a scientific ...
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