Mark

Mark is a very useful teleportation spell in combination with the Recall spell and the eight Virtue Stones.

Trivia
Casting this spell on one of the eight Virtue Stones marks it with the location where the spell was cast - although the stone gives no visual indication of where this location actually is. If the Recall spell is later used on the same stone, the caster is teleported to the place where it was marked without any delay. Thus these two spell make travel around Britannia a lot easier and faster than normal.

Trivia

 * Candice in the Royal Museum actually explains how the spell works.
 * This spell is the only means of instantaneous travel in Ultima VII, after the moongates stop working.
 * The Virtue Stones are all already pre-marked for the Shrines. The two exceptions are the white stone, which leads to Lord British's castle, and the black stone, which leads to Britain.
 * This spell can not be cast while standing on the magic carpet, as this confuses the spell. That's because it saves the ground tile the Avatar stands on.