Dear FE:s, first I want some questions answered.
Is following picture your generally/officially accepted world map? (Edit: apparently not)

Is it you generally/officially accepted point of view that the antarctic is a massive ice wall, that is impossible to cross? (Edit: apparently not)
Is it your generally/officially accepted point of view that there exists something such as earth's magnetic field? (Edit: a bit yes?)
Over to my point;
According to the flat disk map and FE claims, the antarctic is an impossible-to-cross enormous wall of ice, guarded by the government. According to a globe model of the earth, the antarctic is a rather large continent.
Since the antarctic is visited by hundreds or thousands of tourists every year, it is easy to see yourself or listen to the tourists what the antarctic is, and everyone who has visited antarctic or flown over it during a flight between, say, south africa-australia, can verify that the antarctic is indeed a continent and noone has ever witnessed a giant wall of ice, being impossible to cross and sorrounding everything. Therefore the antarctic can't be the edge of the earth.
And according to FE claims, there is no magnetic field on earth. Anyone can see that it exists a magnetic field, that do protect us from dangerous radiation from the sun, in two ways:
1. Travel either to the arctic or the antarctic, or to the northen-most canada, scandinavia or russia. If you are lucky during a night, you will be able to see the famous aurora, which is made out of visible light emitted when radiation from the sun hits the earth's protective magnetic field.
2. Look at a compass. A compass points towards earth's magnetic southpole (Which is the same as the earth's geographic north pole) Without a magnetic field a compass wouldn't work.
Therefore the earth has a magnetic field, and the antarctic can't be the border of the earth.
EDIT:
Extra question:
If the antarctic is not the border of the earth, then what is the border?