Waypoint will show you the direction of a given set of X, Y coordinates.
Know where you need to go, but dont like trying to manually locate the coords on the map - then use Waypoint.
/wp X Y -- sets your target waypoint to world coords X,Y
/wp mode -- toggles between relative and absolute headings
/wp clear -- clears the current waypoint (or right-click the compass icon)
/wp hide -- toggles display of UI when not actively tracking
/wp distance N -- sets how close you need to get to target [default = 5]
/wp update N -- sets text update time to N seconds [default = 2]
/wp text -- toggles display of chat frame updates [default = ON]
/wp scale N.NN -- resizes UI elements to N.NN times default