Really, really enjoying your ground school videos and am learning much. Thank you. That said, I find the part in this video about Dead Reckoning to be confusing. You say "Dead" but the slide says "Ded", and later "Ded not DEAD." 14 CFR refers to "Dead Reckoning." You also say it derives from "Deduced Reckoning", but etymology indicates the first example of "Deduced Reckoning" to be about 1931, while "Dead Reckoning" (navigating from a fixed (or dead) position) can be seen as early as the early 1600s.
Response from Mike Thompson: Yeah, semantics and etymology - both very interesting... I don't know. The point is that what we call "Dead Reckoning" are really Time/Speed/Distance calculations and we are "Deducing" our position (best guess) based upon these calculations. So it's really Ded for Deduced, not dead. However, thinking of it as navigating FROM a known point or DEAD position works too. Could the term "Dead On" be related? Fun to learn about the history, but remember the MAIN point is to navigate accurately using our three methods 1) Electronic 2) Pilotage and 3) Ded or Dead Reckoning.
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Really, really enjoying your ground school videos and am learning much. Thank you. That said, I find the part in this video about Dead Reckoning to be confusing. You say "Dead" but the slide says "Ded", and later "Ded not DEAD." 14 CFR refers to "Dead Reckoning." You also say it derives from "Deduced Reckoning", but etymology indicates the first example of "Deduced Reckoning" to be about 1931, while "Dead Reckoning" (navigating from a fixed (or dead) position) can be seen as early as the early 1600s.
Response from Mike Thompson: Yeah, semantics and etymology - both very interesting... I don't know. The point is that what we call "Dead Reckoning" are really Time/Speed/Distance calculations and we are "Deducing" our position (best guess) based upon these calculations. So it's really Ded for Deduced, not dead. However, thinking of it as navigating FROM a known point or DEAD position works too. Could the term "Dead On" be related? Fun to learn about the history, but remember the MAIN point is to navigate accurately using our three methods 1) Electronic 2) Pilotage and 3) Ded or Dead Reckoning.