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Thanks you JOE
Much appreciated. I had looked , all too briefly at the WX book but
obviously missed the section on speed. Hopefully Jeremy will add a comment
or two as well as George !
73
Irvin

-----Original Message-----
From: navlist@fer3.com [mailto:navlist@fer3.com] On Behalf
Of joseph_schultz@rrv.net
Sent: Thursday, October 22, 2009 11:23 PM
To: NavList@fer3.com
Subject: [NavList 10244] Re: SOA vs SMG or SOG


Hi Irvin,

You may be interpreting what you see on www.sailwx.info as vessel data.
Looks to me like they're calculating from vessel submitted messages into a
"readable" format.  Perhaps SOA was used by the website to differentiate
from the reporting format that the vessel used.

If you go to http://www.vos.noaa.gov/vos_scheme.shtml then on the left side
is a PDF file called Observing Handbook No. 1.  This explains the standard
format for weather messages sent to the U.S., among other good things (but I
wouldn't trust their distance-to-the-horizon table).  The handbook has
Course Made Good (CMG) and Speed Made Good (SMG) for the past THREE hours as
reporting elements.  Nautical miles run is not an element.

Good cloud and sea photos in that handbook, and a few weather rhymes to
boot.

Joe







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