Hello,
If you start at the west bridge from Umbra and then run north to the edge of the starry void. When you get to the void, follow the edge to the west until you see a pedistal with a green crystal on it. 2x click the crystal and you will be teleported to the central isle. Once on the island, you can recall off - or there is also a moongate to take you back. There is also a wandering healer on the island in case you need it while doing the t-map.
Good Luck!