I have a private iOS module, available on request. The module crashes on SDK > 5.2.x.
iOS only, Android module working fine. Related to Geolocation possibly.
Don't forget to request permissions in tiapp.xml.
1) Running in 5.1.1.GA you should see a blue dot on the device location.
2) Running 5.2.x app will crash immediately on (mapview.addLocationLayer()).