Entering the command with 0% practiced in the Cover Tracks's skill receives the following message:
You have no idea how to go about doing that.
In Game Description
Ranger skill: Cover tracks allows one to hide his/her trail through the outdoors. By using woodlands skills, this will allow one to attempt to reduce the visibility of their tracks, and those of others in the same area. When combined with the skill of Ranger Sneak, a trained woodsman can pass almost unnoticed through an area SEE ALSO: Ranger Sneak, Track