NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: SOA vs SMG or SOG
From: Joe Schultz
Date: 2009 Oct 22, 23:22 -0700
From: Joe Schultz
Date: 2009 Oct 22, 23:22 -0700
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 --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList+@fer3.com -~----------~----~----~----~------~----~------~--~---
