A skull means the monster is weak enough to limp.
A drooling mouth means the monster is exhausted.
The "U" is actually an eye, and displays the monster's aggro status. White means it is not in combat, yellow means it is in combat, and red means it is enraged.
The green arrows indicate that the monster is at a higher elevation than your current position.
The red arrows indicate that the monster is at a lower elevation than your current position.
The numbers show the monster's distance from your current position.

A skull means the monster is weak enough to limp.
A drooling mouth means the monster is exhausted.
The "U" is actually an eye, and displays the monster's aggro status. White means it is not in combat, yellow means it is in combat, and red means it is enraged.
The green arrows indicate that the monster is at a higher elevation than your current position.
The red arrows indicate that the monster is at a lower elevation than your current position.
The +/- numbers show the monster's altitude from your current position.

A skull means the monster is weak enough to limp.
A drooling mouth means the monster is exhausted.
The green arrows indicate that the monster is at a higher elevation than your current position.
The red arrows indicate that the monster is at a lower elevation than your current position.
The numbers show the monster's distance from your current position.

A skull means the monster is weak enough to limp.
A drooling mouth means the monster is exhausted.
The "U" is actually an eye, and displays the monster's aggro status. White means it is not in combat, yellow means it is in combat, and red means it is enraged.
The green arrows indicate that the monster is at a higher elevation than your current position.
The red arrows indicate that the monster is at a lower elevation than your current position.
The numbers show the monster's distance from your current position.