Once an egg is placed in an incubator the player must travel the distance shown on the egg 2km, 5km, or 10km. Once the target distance has been reached the egg will hatch and the Pokemon inside is yours!
The distance is tracked using your phone’s GPS so you can’t cheat the system by traveling in vehicles – the GPS knows you are going to fast!
You start the game with one incubator that has unlimited uses. Additional incubators can be found at Pokestops or bought via the in-game shop. Found and purchased incubators are only able to hatch 3 eggs each before breaking.