The Track Undead skill provides the means to track monsters or players classed as beasts. This skill is a class skill that Hunters and Templars/Crusaders acquire (Archer/Healer/Fighter Evolution line) you can also use it by gaining items with bonuses to the skill.
To track undead after getting this skill use the World > Track > Undead screen.
Skill Use
Use World > Track > Undead and it will show the screen you use to track undeads.
The track undead screen has two modes of operation, this allows you to use the screen to track the location of currently spawned monsters and players or pets and to also track the location of usual spawn spots for monsters.
You can toggle between these two modes by using the option on the right of the screen.
In the top right corner are boxes where you can enter the level range of the target you wish to search for.
When tracking map spawns you should remember that each realm has a set level range so there is little point in using a level range outside of the normal for the realm.
Also not all realms will have each classification of monster.
You can use the white arrow buttons at the bottom of the screen to move the displayed view around, if you find something on the map you will gain a purple skill gain. This skill does not give experience as the reward of finding what you are looking for is intended to be reward enough.
Formula
Skill Required = (Target Level * 5)
i.e. To track level 10 undeads you need 50 track undead skill
You can not track outside of your skill range so if you wish to track higher level monsters than you currently have the skill for you will need to get items with bonuses on them for this tracking skill.