Example image of eyePlorer eyePlorer map for 'Backstaff': Navigation Altitude Thomas Harriot Jacob's staff John Davis (English explorer) Mariner's astrolabe Quadrant (instrument) Transversal (instrument making) John Flamsteed Elton's quadrant Spirit level Thomas Hood (mathematician) Benjamin Cole (instrument maker) Vernier scale Octant (instrument) George Adams (optician) Edmund Gunter Crossbow Almucantar John Hadley Navigational instrument Sextant Kamal Major explorations after the Age of Discovery History of navigation James Cook Sundial
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