In addition to wild Pokémon in your area (now displayed under "sightings"), you will see Pokémon attached to pokéstops in your area.
If you tap one of the Pokémon under "sightings", this message is displayed.
Tapping one of the Pokémon in your tracker will pull up an image showing the pokéstop it is attached to.
If you press "view", the map will zoom out and show you a bird's-eye view of your area, so you can get a sense of where the Pokémon is located.
A tracking icon is displayed rendered in the game to indicate which pokéstop you should be going to.
Pokéfinder after selection
After you have selected a Pokémon in your tracker, you can reopen the Pokéfinder and press "clear" to deselect the Pokémon.
When you approach a pokéstop with an attached Pokémon, the Pokémon will appear roughly within lure range. Pokémon attached to a pokéstop are indicated by white circles under their model.
If the Pokémon despawns before you reach it, the game gives you an alert informing you that the Pokémon has fled.
So that's it guys! That's all you need to know about your new Pokemon GO tracking system. Go and enjoy it!