iPad 2 Wi-Fi/GPS Sensor

I have a technical question for the iPad 2 Wi-Fi (or actually iPad in general). I am creating a map based application and get the longitude and latitude to show to a user the accu开发者_如何学编程rate location, speed, course ...

In the end it should also work offline without Wi-Fi. But if i switch off the WiFi i get no change in lat. and long. anymore.

I actually thought, that the iPad does not mainly use hot spots to get the actual position.

Or is it possible, that the GPS-Sensor is part of the Wi-Fi module?

The iPad 2 WiFi does not have assisted GPS (see spec here). It will have some location services when connected to a WiFi network.