You finally post in this thread and you don't even answer the question??? Well, you dodged it earlier, but you never followed up to my rebuttal.
"Rebuttal" is a rather grand way to describe a post which contained an irrelevant side-point and continued ignorance. Nevertheless...
He answers! Perhaps you should modify the map I posted? You know, showing instead of a definitive edge, some sort of "gray area".
Why? This is what's known, and this is what's presented. I'm not going to attempt to outline any of what lies beyond the known Earth, because it is unknown. There is no 'definite edge', just a limit to what we have explored.
As for the navigation, your map suggests that one could use to travel due south, then across the south pole, and then on to the "edge/gray area". On a globe, once you cross the south pole, you are then heading north, on your map, you are still heading south. I guess this is where you're going to exclaim, "It's an incomplete map!"
On my map, you are not heading south once you pass the south pole. On this, everyone in the thread bar you is in agreement, FE'er and RE'er alike. Travelling 'south' means travelling towards the south pole, be it magnetic or geographic. You cannot travel away from the south pole and still be travelling south.
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OK, so you tell me, on your map, if you are traveling south along the Prime Meridian and cross the south pole, then continue in the same direction, where do you go? According to your map, you would run into this "unexplored" region. If this is incorrect, please redraw the red line to show what would happen?