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Fw: Somewhere in the Pacific
From: Andrés Ruiz
Date: 2008 Dec 25, 10:40 +0100

The fix for near limb observations:

B = 21.26958º N
L = 156.218458º W

Input data:

Be
20.0
Le
-160.0
IE
0
hEye[m]
3.6576
T[ºC]
10
P[hPa]
1009.144
LDobs1
63.51
LDobs2
27.85
GHAmoon1-12:00UT-22/06/2008
134.876173
DECmoon1
-17.261033
HPmoon1
0.9238588
SDmoon1
0.251735167
GHAstar1-Antares
203.551253
DECstar1
-26.453262
SDstar1
0
GHAmoon2
134.876173
DECmoon2
-17.261033
HPmoon2
0.9238588
SDmoon2
0.251735167
GHAstar2-Fomalhaut
106.506820
DECstar2
-29.573826
SDstar2
0

Output:

iter	B	L	M	m	S	s	LDtrue	LDclear	dLDcldB	dLDcldL	Z	p	dif LD
1	20	-160	45.315292	44.674163	27.218422	27.249892	63.698208	63.635674	0.007064	0.014007	64.643217	3.790936	0.062534
1	20	-160	45.315292	44.674163	18.50617	18.554528	28.687464	28.726873	0.005524	-0.012199	-66.949811	-2.793292	-0.039409
2	20.021485	-159.936421	45.332139	44.691193	27.161497	27.193044	63.698208	63.636717	0.007061	0.014014	64.665993	3.726246	0.061491
2	20.021485	-159.936421	45.332139	44.691193	18.535672	18.583948	28.687464	28.726216	0.00552	-0.0122	-66.970117	-2.746535	-0.038752
3	20.0426	-159.87392	45.348612	44.707846	27.10553	27.137153	63.698208	63.637742	0.007058	0.01402	64.688378	3.662685	0.060466
3	20.0426	-159.87392	45.348612	44.707846	18.564634	18.612829	28.687464	28.72557	0.005516	-0.012201	-66.989976	-2.700555	-0.038106
4	20.063353	-159.812479	45.364722	44.724132	27.050503	27.082201	63.698208	63.63875	0.007055	0.014026	64.710377	3.600233	0.059458
4	20.063353	-159.812479	45.364722	44.724132	18.593065	18.641181	28.687464	28.724934	0.005512	-0.012202	-67.009397	-2.655342	-0.03747
5	20.083748	-159.752078	45.380477	44.740059	26.996402	27.028174	63.698208	63.639741	0.007052	0.014032	64.731999	3.538868	0.058467
5	20.083748	-159.752078	45.380477	44.740059	18.620977	18.669015	28.687464	28.72431	0.005508	-0.012203	-67.028394	-2.610881	-0.036846
6	20.103794	-159.692701	45.395886	44.755636	26.943209	26.975055	63.698208	63.640716	0.007049	0.014038	64.753249	3.478572	0.057492
6	20.103794	-159.692701	45.395886	44.755636	18.648377	18.69634	28.687464	28.723695	0.005504	-0.012204	-67.046975	-2.567161	-0.036231
7	20.123495	-159.634329	45.410958	44.770872	26.890911	26.922829	63.698208	63.641674	0.007046	0.014044	64.774133	3.419325	0.056534
7	20.123495	-159.634329	45.410958	44.770872	18.675278	18.723167	28.687464	28.723091	0.0055	-0.012205	-67.065151	-2.524171	-0.035627
8	20.142859	-159.576945	45.4257	44.785776	26.839492	26.87148	63.698208	63.642617	0.007044	0.014049	64.794659	3.361107	0.055591
8	20.142859	-159.576945	45.4257	44.785776	18.701689	18.749504	28.687464	28.722497	0.005497	-0.012206	-67.082934	-2.481898	-0.035033
9	20.16189	-159.520532	45.440121	44.800354	26.788936	26.820995	63.698208	63.643544	0.007041	0.014055	64.814833	3.303902	0.054664
9	20.16189	-159.520532	45.440121	44.800354	18.727618	18.775363	28.687464	28.721913	0.005493	-0.012207	-67.10033	-2.44033	-0.034449
10	20.180596	-159.465075	45.454229	44.814616	26.73923	26.771358	63.698208	63.644455	0.007038	0.014061	64.83466	3.247689	0.053753
10	20.180596	-159.465075	45.454229	44.814616	18.753076	18.800751	28.687464	28.721339	0.00549	-0.012208	-67.117352	-2.399457	-0.033875
360	21.266584	-156.227439	46.155978	45.524095	23.827228	23.86388	63.698208	63.698058	0.006879	0.014386	65.981344	0.008865	0.00015
360	21.266584	-156.227439	46.155978	45.524095	20.180878	20.224916	28.687464	28.687558	0.005336	-0.012292	-67.9742	-0.006635	-9.4E-05
384	21.267579	-156.224458	46.156512	45.524635	23.824538	23.861195	63.698208	63.698108	0.006879	0.014386	65.982388	0.005922	0.0001
384	21.267579	-156.224458	46.156512	45.524635	20.182138	20.226174	28.687464	28.687527	0.005336	-0.012292	-67.974867	-0.004433	-6.3E-05
385	21.267612	-156.224358	46.15653	45.524653	23.824448	23.861105	63.698208	63.698109	0.006879	0.014386	65.982423	0.005823	9.9E-05
385	21.267612	-156.224358	46.15653	45.524653	20.18218	20.226216	28.687464	28.687526	0.005336	-0.012292	-67.97489	-0.004359	-6.2E-05
744	21.269576	-156.218472	46.157584	45.525719	23.819138	23.855804	63.698208	63.698207	0.006879	0.014387	65.984483	0.000014	1E-06
744	21.269576	-156.218472	46.157584	45.525719	20.184669	20.228698	28.687464	28.687464	0.005336	-0.012293	-67.976206	-0.00001	0
1000	21.26958	-156.218458	46.157586	45.525722	23.819125	23.855791	63.698208	63.698208	0.006879	0.014387	65.984488	0	0
1000	21.26958	-156.218458	46.157586	45.525722	20.184675	20.228704	28.687464	28.687464	0.005336	-0.012293	-67.976209	0	0

Dave, I hope, now is correct. The chart shows the AP and the obtained fix, near Hawaii.

Andrés Ruiz
Navigational Algorithms
http://www.geocities.com/andresruizgonzalez/

De: NavList@fer3.com [mailto:NavList@fer3.com] En nombre de d walden
Enviado el: domingo, 15 de junio de 2008 5:35
Para: navlist
Asunto: [NavList 5456] Fw: Somewhere in the Pacific

It's 1200GMT 22 June 2008. You think you're somewhere north of Hawaii within 200 miles. No horizon visible. You get two quick lunar distances (very quick, both at 1200.) Moon near to Fomalhaut 27 deg 51.0 min and moon near to Antares 63 deg 30.6 min. IC zero. Ht of eye 12 ft. T 50 deg F. Pres 29.80 inches.

Luckly, while you don't have GPS, you do have a computerized Lunar Calculator program.

Where are you?

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