On Mar 2, 7:11 pm, "Garland Gray II" wrote:
"Roger Long" wrote in message

...

Half the wave is down and half the wave is up Roger Long

This seems to be a good time to raise this issue. The Annapolis Book of
Seamanship, and others, agree with your statement, Roger.

But I am sure I have read somewhere that wave height, like the amplitude of
a sound or radio wave, is measured from the average to the extreme. This
would result in a value of one half what is commonly stated. This causes me
to pause when someone asks "how high are the waves ?".

Has anyone else heard of wave height measured this way ?


Crest to trough = wave heigth
but the stinker is when we hear or read the "marine forcast" and it
mentions wave heigth. I that measurment is a mean or average
calculation of what?