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Essentials of Positioning and Location Technology by David Bartlett

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9 Location-based services and applications

9.1 Essential principles underpinning services and applications

9.1.1 Navigation

There are relatively few applications for which location or position is the core purpose. Navigation is the notable example in which the purpose is to find a place or navigate a route to a place. Before the advent of modern technology ocean navigation was a huge problem facing mariners at sea. With the help of a sextant measuring the inclination of the Sun above the horizon at midday allows one’s latitude to be estimated. However, determining longitude is far more difficult. Sobel [9] describes the impact of this problem and efforts to solve it in the days of the early great sea navigators.

Given modern GPS systems it is easy ...

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