NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
SOA vs SMG or SOG
From: Irv Haworth
Date: 2009 Oct 20, 18:24 -0700
--~--~---------~--~----~------------~-------~--~----~
NavList message boards: www.fer3.com/arc
Or post by email to: NavList@fer3.com
To , email NavList+@fer3.com
-~----------~----~----~----~------~----~------~--~---
From: Irv Haworth
Date: 2009 Oct 20, 18:24 -0700
I'm somewhat
perplexed over current usage of abbreviations: to wit the old (last 25 years ?)
standard meaning of SAO (speed of advance) versus what I believe is
the current view as presumably held by WMO (World Metro Org. ) who supply
ships with free equipment and training to report weather..VOS (Voluntary Obs
...)
What follows is an
slightly edited (name of ship etc removed by me) recent report.
The noon to noon
report based on positions shows 425 NM ( my Rhumb calc. gives 424.5 NM)
which they report as a SAO of 17.7 kts.
To me the SAO should
more rightly be termed the SMG (speed made good) .
I contacted the
webmaster but despite being an old US Navy chap had no idea.
Hopefully some
members might shed some light on matter for someone who may have slipped a notch
or two without realizing the new movement....hi..hi
himself aka
Irvin
Last reported at 2009-Oct-19 12:00 UTC.
Time now 2009-Oct-19 18:30 UTC.
Position S 17°12', W 179°42'.
Wind from 160 at 14 knots
Waves 1.0 meters (3 feet), 10 second period
Barometer 1012.0 mb
Air temperature
25.0 ° C
Dewpoint 19.1 ° C
| Notes | date/time | lat | lon | naut. miles run | SOA | wind from | knots | barom. | wave height | air temp | dew point | water temp |
| 2009-Oct-19 12:00 | S 17°12' | W 179°42' | 425 | 17.7 | 160 | 14 | 1012.0 | 1.0 | 25.0 | 19.1 | ||
| 2009-Oct-18 12:00 | S 15°00' | W 172°42' | 50 | 16.6 | 120 | 12 | 1010.2 | 1.5 | 26.0 | 21.8 |
--~--~---------~--~----~------------~-------~--~----~
NavList message boards: www.fer3.com/arc
Or post by email to: NavList@fer3.com
To , email NavList+@fer3.com
-~----------~----~----~----~------~----~------~--~---
