NavList:

That's about what I got too Greg with LOP solutions; once I un-corrected my non-existent index error that I accidentally left in the program.

 

To fully disclose my shooting situation, I was using a 6x Alidade on a gyro repeater for my shooting.  It has a nice set of colored filters including a strong ND filter on a turret to shoot all sorts of things both on the horizon and up to about 60 degrees of elevation.

 

While the LOP errors could be considered reasonable on a small craft with less than ideal shooting conditions, low altitude sun sights have much greater errors than I am used to and therefore I don't like or particularly trust them.

 

This next trip I will shoot some more to get a better spread of data.

 

Jeremy

 

Jeremy,

I worked your upper and lower limb sunset examples using a palm program to derive a standard LOP azimuth and intercept with the given GPS position of 16°33'N 129°7'E as A.P.,Height of eye 100ft., Pressure /Temperature correction from A4 of +3'. No index error applied.

Sun L.L. 18:58:16 ZT
Hs 0°0'
Azimuth 294.3°
Intercept 3.9' away

Sun U.L. 19:00:48 ZT
Hs 0°0'
Azimuth 294.5°
Intercept 2.2' away

This shows that your observations with the naked eye were very good. The sunset Longitude solution should work out if a precise table or program is used.

GRudzinski
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