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Edmund Halley's worldmap of prevailing winds and compass variations
Nova & accuratissima totius terrarum orbis tabula nautica variationum magneticarum index juxta observationes anno 1700 habitas constructa, byEdmund Halley, 1730
The compass variation was one of the possible ways to find longitude at sea!
1730

The Nautical Almanac and Astronomical Ephemeris, for the year 1767 Maskelyne
The first nautical almanac to contain data dedicated to the convenient determination of longitude at sea.
It was the first to include tabulation of lunar distances as a tool to facilitate the determination of longitude at sea. By Nevil Maskelyne
1766

3 Charts of British Channel extending from Dover to the Isles of Scilly
3 large maps by Jefferys Thomas on canvas in morocco pull-off case: , A Chart of the British Channel, extending from Dover to the Isles of Scilly on the English Coast, and from Cape Gris-Nez to the Isle of Ouessant on the French Coast
1775
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