This is actually rather less impressive than it sounds: Yonaguni is only about 100 km away from Taiwan. The major difficulty would be actually finding Yonaguni

This is actually rather less impressive than it sounds: Yonaguni is only about 100 km away from Taiwan. The major difficulty would be actually finding Yonaguni, as it's comparatively a very small island. https://www.google.com.au/maps/dir/Yonaguni/taipei/@24.5085305,121.8467353,9.09z/data=!4m13!4m12!1m5!1m1!1s0x34674de19cdcab25:0xabd5fdc669e9f772!2m2!1d123.0085106!2d24.4616586!1m5!1m1!1s0x3442ac72bce20a99:0x3f6a35cedd0ac2e0!2m2!1d121.5654177!2d25.0329694?hl=en https://www.google.com.au/maps/dir/Yonaguni/taipei/@24.50853...