"you can get your camera out zoom in and then there you can see the ship again."
No, you really can't. The only way to see the ship again is to go higher up so you can see further over the horizon.
A few things that can't be explained satisfactorily by the flat earth model:
The behaviour of earthquake waves.
The sun striking the earth at a different angle at the Solstices depending on your latitude.
The moon being 'upside down' when viewed in the southern hemisphere compared to our pov in the north. (Hint: it's not the moon that's upside down, it's you).
The shape of the shadow cast by the earth during lunar eclipses (mentioned by Aristotle in the 4th Century BC).
Flight times on the flat earth model simply do not work.
The Southern Cross and Sigma Octans (the southern pole star) are seen due south at night from Australia, South Africa as South America, even though according to the flat earth model, these point in different directions.
To plot an accurate position using a sextant, you need to know precisely your height above sea level when you take the sighting - even a few metres extra elevation will change the angle between your sighting of the sun v that of the horizon, and can make your result different by many miles.
Storms rotate in different directions in the northern hemisphere compared to the southern.
There are others.