Also Dutton's Navigation and Piloting , thirteenth edition. Index,
deduced reckoning..see dead reckoning.

Section 8 Dead Reckoning
Introduction 801 " Dead Reckoning (DR) is one of the four main
divisions of navigation.....The term is derived from deduced or ded.
reckoning, the process by which a ships position was deduced or
compared trigonometrically, in relation to a known point of
departure.....

DR Defined 802 " Dead Reckoning is the process of determining a ships
approximate position by applying to its last well-determined position
a vector or a series of consecutive vectors representing the run that
has since been made using only the true courses steered and the
distance run as determined by log, engine revolutions, or calculations
from speed measurements, without considering current....."








On 19 Jul 2004 02:14:13 GMT, (Gould 0738) wrote:

"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".