Locate

If a sextant is missing, the spell Locate can substitute it.

Spell Description
Casting the spell reveals the exact location of the mage on Britannia in longitude and latitude, the same as if using a sextant would do. It can even do so when being underground - something a sextant logically can't accomplish. However, this spell needs the rare and expensive nightshade, making it quite expensive. Over time it simply is more economical to just buy a sextant.

Trivia

 * The spell does also appear in the SNES-Port of Ultima VII. In it, the spell not only shows the current location, but also all the various locations on the map of Britannia, as seen on the right. The same interface is used for teleportation and boat travel.