Precise mapping - PowerPoint PPT Presentation

GPS Navigation and Data Structures

GPS Navigation and Data Structures. By Michael Cabassol and Augie Hill. How GPS Works. 24 Satellites orbit Earth 11,000 Nautical Miles high (12,658.8 miles) Each makes an orbit in 11 hours 58 min 24 satellites run on 6 orbits 4 Satellites are needed to triangulate position. Visual Example.

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374 views • 6 slides

Focussing Ruler

Focussing Ruler. 1 How are angles measured in a field ?. 2 What does a focussing device consist of ? 3 Where is the focussing ruler set? 4 What is it made of ? 5 How is the horizontal setting up of a gadget achieved ? 6 What is acceptable for sketch maps ?

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191 views • 3 slides

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