If the earth is Flat, then how is it possible to fly across the Pacific to North America, across the Atlantic to Europe, then across Asia back to the Pacific again? ALL IN A STRAIGHT LINE? This would only be possible on a globe, unless we reach the edge of your Flat Earth and teleport to the other side like Pacman…
This is a very common question (yes, even the Pacman part) regarding Flat Earth Theory. Basically, how can one travel in a straight line and end up exactly where they started out? If Earth is Flat, they should have fallen off the edge… However, there is an obvious (though unapparent) answer: navigational equipment.
Compasses and most other navigational equipment are built under the guiding assumption that magnetic north represents a central reference point, the point from which the device orients itself. But as a point of reference, magnetic north could also exist as the center point on a diskoid earth.
In this case, navigational equipment would lead navigators along the earth; not around it. A pilot that sets out from the east coast of North America, heading towards the west coast of Africa, travels in a distinct path along the disk Earth’s surface. He merely thinks that he is traveling part way round a globe. It is important to remember that every worldwide voyage utilizes some sort of navigational aid. Even ancient sailors used the stars. But stars or pieces of equipment each operate in relation to a frame of reference. It is perfectly possible to assume one reference frame and use it to get somewhere, when you are actually using another.
For example, imagine you are preparing a road trip. You program your GPS with a destination. You select “fastest route” because you want to arrive as soon as possible. Keep in mind that “fastest route” represents frame of reference as discussed above. However, when you finish programming your GPS imagine that you accidentally selected “scenic route” but didn’t notice. You go on your trip and get the best views of your life, and arrive at your destination all the same. The only thing that seems off: it’s a bit later than you expected. You navigated believing that you were using a “fast” reference frame. In reality, you traveled along different route and didn’t realize it.
The above analogy describes circumnavigation along the Flat earth. Travelers think they are going one way, when in fact they are traveling in way that is similar but different. Its all about assumptions. The shape of the earth is not the main issue.