My only point was that there IS a correct way to use the term "KPH",
although it
is frequently used incorrectly. "Knots" includes an implied "per hour",
so the
only time you would add "Per Hour" after knots, (KPH) would be to
describe by
how much speed something (wind, boat, dolphins) was increasing or
decreasing on
average referenced to an elapsed hour.

rusty redcloud


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"Knots per hour" is an incorrect usage.

Since a 1 knot speed is equal to a nautical mile per hour, some people
might wonder why they are spelled differently. "Knot" isn't a
misspelling of "naut".

Using knots to measure speed dates back to the days of sail. A
midshipman or the quartermaster would be required to measure the speed
of a vessel at regular intervals, make a note of it in a log, and make
report to the master and/or navigator.

To measure speed, a wooden, wedge-shaped board (speed log) was tossed
overboard. A spooled line would be attached to the board, and the line
would be allowed to pay out as the board was left in the vessel's wake.
The line payed out for a short but precisely measurable period of time.
(A short interval sand glass would have been used)
A series of knots were tied in the line at known intervals, and the
seaman measuring the speed would count the number of knots that slipped
through his fingers during the measuring period. Speed would be
reported as "eight knots" if eight knots slipped though the fingers of
the party doing the measuring.

The math is simple, but ingenious. The time interval will be a specific
portion of an hour.
Say for example the measuring exercise took place for 30 seconds after
the "log" splashed down- that would be 1/120th of an hour. If the knots
were tied in the line 1/120th of a nautical mile (about 47 and 1/4
feet) apart then at 1 nautical mile per exactly 1 "knot" would pay out
during the measuring. If 6 X approx 47 1/4 feet payed out in 30
seconds, then the vessel would cover six nautical miles in an hour, or
be making a speed of six knots.