[Repealthe17thAmendment]

Whether you can see the curvature of the earth or not, the existence of the horizon proves it is curved. It's because of the curve that we can only see a limited distance.

When a ship on the ocean drops from view along the horizon, it has not submerged, it is obscured by the curve of the earth.

[philman_36]

It's because of the curve that we can only see a limited distance.

Our eyes are why we can only see a limited distance.
Devices like cameras, telescopes and binoculars can extend the range of human eyesight.

When a ship on the ocean drops from view along the horizon, it has not submerged, it is obscured by the curve of the earth.
A ship drops from sight because of the limits of the human eye.
Surely you've experienced the effects of perspective and the vanishing point somewhere at some point in your life.

[philman_36]

Some of the many examples...Unbelievable Epic Zoom Powers P900 Nikon

Laguna Beach California

One from right here close to home...Shrimp Boat Nikon P900 Zoom Test

[philman_36]

How about a cruise ship? Is that big enough?
P900 Nikon cruise ship

Shouldn't all of those objects still be hidden by "the curve" since you can't see them with your naked eye?

[Does so]

I should mention that Columbus’ generational ships were tall ships, and could see other tall ships approaching—topgallant and sky sails first.

[philman_36]

How about a tanker ship? Is that big enough?

Nikon CoolPix P900 Zoom Test Beach to Cargo Ship1

Kind of blows your assertion out of the water, doesn't it.