yeeeeeeeeeeeeeeeeeeeeeet, it is physically impossible to know where you are on
the planet using just a compass and a speed indicator. that some people
believe otherwise just goes to show you that some people are utterly ignorant.
the rocks don't care what you believe. not in the slightest.

"ded" is the correct term, "dead" is not.




No entry in Lenfesty for "Ded Reckoning."

There is an entry for "Deduced Reckoning." It reads, "See Dead
Reckoning."

No entry at all for "Ded" or "Deduced" in
Mckenna. Only for "Dead Reckoning".


Try Bowditch, you'll find some variations (at least in the older editions).
The point being that there are a number of definitions (if you will)
which tend to revolve around this term, and, as in many things
"maritime", many of them vary to some degree based on various national,
regional, vessel type (ship/navy/yacht), historical usage.
It is not as important that you have a specific definition for the term,
as it is that those discussing it, are aware there can be different
interpretations and that their discussion revolves around one particular
interpretation ...... something jax hasn't a clue, may be possible.

otn