Æther Mark

You create an invisible Arcane Mark on anything within range that you can clearly see. Unless someone uses the detect magic spell or have a similar ability they won't know of it's existence. As long as the mark exists you know of its general direction. At any given time you may have a number of Æther Marks active up to 3x your Proficiency Bonus. At any time you can choose to dispel the marks as a free action.

Once you reach 10th Level, you know the exact location of all your active Æther Marks.