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===Mental navigation checks=== By mental navigation checks, a pilot or a navigator estimates tracks, distances, and altitudes which will then help the pilot avoid gross navigation errors.<ref>''The Handbook of the SAS and Elite Forces. How the Professionals Fight and Win''. Edited by Jon E. Lewis. p. 370 "Tactics And Techniques, Personal Skills And Techniques". Robinson Publishing Ltd 1997. {{ISBN|1854876759}}</ref>
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