Scrolling trough FES' WIKI under the chapter “Circumnavigation” I found this:
Q. What about other types of navigational instruments?
A. Using a compass, gyrocompass, or looking at Polaris as a reference for Eastwards or Westwards travel will take the navigator in a broad circle around the North Pole.
Of course this answer would not be complete without mentioning the Gyrocompass, because since wooden ships were replace with metal ships, the magnetic compass became rather useless and had to be replaced with a non-magnetic compass.
This happened after the first usable gyrocompass was introduced in 1908, a compass based on a spinning gyroscope. How does it work:
When you have a spinning gyroscope, and you push against the axis to change the direction of it, you will feel friction; the gyroscope will push back in the opposite direction of your force. If you fix that gyroscope on the surface of a ball, with the axis of spin horizontally to the surface of the ball, and you start slowly rotate that ball, the spinning gyroscope will start to push in the opposite direction as the spin of the ball is changing the axis of the gyroscope. If you now install that gyroscope in a device that can perceive that force and the direction in which the gyroscope is pushing when it is moved, then that device can show you in which direction you spin that ball.
Now since globelings believe that the earth is also a spinning ball, they came up with the ingenious idea to use that principle of gyroscopes to create a non-magnetic compass, and after long deliberation they called it the “gyrocompass”
Of course FE'ers know better, they know that the inventors of the gyrocompass made a huge mistake by assuming that the earth is a spinning ball and therefore their invention would work, but they can't ignore that the gyrocompass has proven its services successfully for more than a century. Now my question is, how does FET explain the success of the gyrocompass? What on a flat earth makes the gyroscope move in such a way that it shows the geographical directions?