The radar is a feature that can be used by both jailbroken and non jailbroken users, however non jailbroken users will generally only be able to see some gyms and or pokestops around their area, provided that area is covered in our database.
Non jailbroken users will occasionally see some pokemon as well.
Jailbroken users will be able to access data intercepted from the game in order to see pokemon spawns around them as well as pokestops and gyms whether or not they are in our database.
To use the radar, turn on Map Fetch in the settings, then press the coin stack button on the map. The button may need several presses and the map may need to be closed and reopened a few times.