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Sextant In Space
It may be hard to believe, but today’s astronauts use an 18th century marine navigational tool as back-up technology.
Sextants have been the primary device for offshore navigation for centuries, initially developed to guide mariners on trade route passages. While they are used to measure angles between a celestial body and the horizon, they can also be used to measure the apparent height of a known landmark for determining range, or to measure the angle between two landmarks to establish a line of position.
Estimating Distance Off
Got a tape measure and a piece of string? You can use them to find out how far away you are from, say, a lighthouse.
A magnetic compass may be old technology, but it's still an essential navigational tool.
Get back to basics by learning how to navigate using a few simple tools and some common sense.
Finding your position to within a few feet anywhere on the earth's surface is simple, thanks to GPS.