NavList:

Frank, you wrote, "Are you playing a game?"

Hm, I am just following your advice in a previous message and creating an arc correction table by keeping track of my sightings and also the values shown from your app. There seems to be a simple pattern when I compare the values and I am applying some trivial math to it. This math seems to be working well for my sightings so far over a range of altitudes. I am assuming that this math reflects the "inner workings" of this sextant, much like I read in a message somewhere (it might have been yours), that you don't need to bother about perpendicularity error, this can pretty much be fixed via an arc correction table.

I was assuming it might be interesting for other users of a plastic sextant to see that there seems to be a way to get better LOPs than "straight from the sextant", just like it was interesting for me to read what Greg has done here, and you too have written messages on using your app to calibrate a sextant. In my eyes I was just following up on that.

Norman