Eye of Tallon (Wizard spell) should work in Plane of Sky. After searching an old archive Plane of Sky guide I noticed something in a screenshot (attached below). This raid took place on 10/2000, which was sometime during Kunark.
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"Succesful change to Eye of Winday's perspective" As you can see Winday is a Wizard. This screenshot was taken by dropping an eye off Island 8 looking down at Island 2.
To visit the actual page go to this link -
http://web.archive.org/web/200105062...guya.com/vane/
Let the site load then click
Data, then click
Plane of Sky Raid on E'ci Server 2000/10 third screenshot from the top.