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Greg,

The height of eyes and the distance to the oil rig are so small that a
more detailed calculation doesn't result in a noticeable different
height of the oil rig than what you obtained by using the Bowditch
formula.

After correcting the program, the result has slightly improved. Loc 1
has shifted by about 500m to 600m towards north from its previous
position. The azimuth line from this point passes Gilda now between
0.9 km to 1 km south of it. However, for some unknown reasons I obtain
now a minutely larger azimuth which shifts the expected photo-location
further south by about an additional 100m. I didn't expect such a
difference in azimuth from those modifications. So, I still have
something to search for.

BTW, what program did you use for these calculations? May be the one
where you showed an input form?

Thank you for the details on the Pacific Brown Pelican. Its really a
nice bird. I leave it however to you to calculate its distance by
estimating the projection angle and the ratio actual vs. average wing
span.

Thank you, Greg, for this exercise which helped me to verify parts of
my program. It also may have shown to the other members of NavList how
the location can be found from a timed photo.

Marcel

   

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