Peer

The spell Peer - in the older times of Ultima IV called View - is needed for orientation in the wilderness or dungeons.

Spell Description
If the mage needs a quick overview of the current surroundings, Peer is just the right thing. It shows an overhead view of the area around the mage in the form of a magical map. This map helps wise spellcasters to properly orient themselves if lost in the wilderness or deep within a dungeon. However, it doesn't warn the caster of the nature of any nearby enemies. For that task, the Wizard Eye spell should be employed to spy out possible enemies.

The spell has the same effect as Peer Gems (as well as the magical Mapping Helms found in Ultima II).

Of note is that in the Age of Armageddon the spell lost much of its usefulness. During that time, it could only show the position of the mage on the world. Even though that also works while being underground - something a sextant logically can't accomplish - it is far less useful than its earlier incarnations.

Trivia

 * In Ultima VII a sextant and map of Britannia have the same effect, the spell essentially having become useless.