NavList:

Joe P:

Yes, refraction and all other physical phenomena that can be included are included. Thus the altitude you see on the device should exactly match what you see on your sextant if your sights are perfect.

Among other uses, this means you can use the app to generate simulated altitude sights that are as close to reality as possible. For backyard "lunarians", for example, you can measure the angle from the Sun to the Moon with your sextant but measuring the separate altitudes of the Sun and Moon, required as auxiliary inputs to correct or "clear" the lunar, can be difficult from a backyard setting. So cheat a little: apply you sextant skills and yur observing expertise to the primary parameter, the difficult observation, the lunar distance itself, but use the app for the altitudes. :)

Frank Reed
ReedNavigation.com/GPSAntiSpoof/