You claimed sextants don't plot onto a sphere, I showed that yes, the math indeed takes a sextants measurements and plots it onto a sphere. This is a simple fact, the math is very clear.

You showed that math doesn't actually plot things on a sphere.

Please show where I showed math that doesn't plot data onto a sphere for a sextant. I'll quote myself earlier, saying the opposite.

You stated quite succinctly that ships do not carry spheres for charting.

You stated they carry flat charts and maps.

You wrote it, I didn't.

Why would you ask me to show you something you wrote?

If I draw a picture of you on paper does it mean you are flat?

You and I both know that I am not flat.

The reason we know this is simple.

Simply by standing in the same room, you can see that.

No such luck with the supposed globe.