They still rely on Google Maps. Although Apple has reportedly had his own Maps.
Apple Discourse to iOS 5 planning to release this self map application has appeared about two years ago, when Steve Jobs-led company acquired two companies mapping: Poly9 and Placebase.
Rumor is known to become stronger after Apple opened job opportunities to the business of mapping. According to reliable sources Google, Apple will release a yet unknown applications still rely on maps and Google Maps.
With rumors of the acquisition, job opening, and so on, some parties believe Apple will seriously play mapping affairs. If so, slowly the Google Maps would be shifted from the iPad, or iPhone. Also increasingly fierce competition.