"JAXAshby" wrote in message

The following of some of the definitions of the word "dead" and each shows
why
the word is not used in the context of the guestimated, vague navigation
called
Ded(uced) Reckoning:


Both dead reckoning and ded reckoning are considered acceptable in common
daily usage, jax.

I might also point out that the method in question is not nearly so
guestimated and vague as you state. Successful DR navigation depends
largely on 1) accurate and detailed planning; 2) careful and accurate
boat handling; and is also affected by 3) unanticipated factors, which can
be ameliorated to some extent by (1).