Ran into this while reading the forums about the noble sky rotations:
http://mysite.verizon.net/drexxell/eq/planeofsky.html
Peaceful, tiny island, rarely visited. Originally a one-way trip from Island #1, this island had a telepad installed around 2003 which leads to Island #2. Thus, because it can be done between islands #1 and #2 (but is not required) it is given #1.5.
Seems like a reliable source, anyone else come across something like this?