NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Antoine Couëtte
Date: 2013 Mar 8, 11:09 -0800
RE : NavList Post # 22641
Let us change things up a bit with this round of stars. 5 bodies, with one that can be reduced as an ex-meridian of an upper transit (hint it's Achernar).
We are going a bit faster now so you might want to advance the later sights for accuracy.
Ship data:
Date: 16 January 2013
ZD -9 (note change)
Crs: 049 Deg
Spd 14.6 knots
Height of eye: 83 ft
Index error: 0.9' on the arc
Temp 72 deg F
Pressure 1016 mB.
GPS fix at 1900-00 is Lat 20-38.6'N Long 120-48.9'E
Star Data:
Capella: 1900-27 Hs 40-40.2'
Aldebaran: 1901-12 Hs 50-13.3'
Rigel: 1902-27 Hs 32-03.8'
Achernar: 1904-01 Hs 12-21.2'
Fomalhaut: 1905-32 Hs 24-43.2'
Fix a celestial fix at 1900 LT, "error" from the GPS fix, and standard deviation of the intercepts.
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Hello Jeremy,
From your GPS Position used as DR, and updated for each observation time, I get:
CAPELLA -0.5NM/046°4
ALDEBARAN +0.4NM/088°6
RIGEL -0.4NM/114°4
ACHERNAR -0.1NM/181°8
FOMALHAUT _0.1NM/221°3
Sdev (i.e. LOP's dispersion) = 0.3 NM
Position in Bearing 298° from DR and at distance of 0.1 NM
Lesson learnt : What's the use of the GPS if you can get a Celnav position within 0.1 NM of true Position ?
Attaboy ! Well done, once again, Skipper !
Antoine M. "Kermit" Couëtte
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