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513

Centuries: 5th century - 6th century - 7th century

Decades: 460s 470s 480s 490s 500s - 510s - 520s 530s 540s 550s 560s

Years: 508 509 510 511 512 - 513 - 514 515 516 517 518

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Dead reckoning

... interval (elapsed time from one fix to the next) according to the compass course it is steering and speed it is making. In modern navigation, this plotted position is ...