Blog geolocation sample app does not work with current Xamarin Studio and iOS version

Hi all,

I am interested in the current Xamarin blog sample concerning geo location, Xamarin Forms and device features. Here is the link to the blog sample app on github: https://github.com/stevenyix/Sample---Xamarin-Forms-Dependency-Service

I downloaded the app, because currently I am working on a similar app at the moment.
BUT: I was able to compile and run the iOS version of the app, but it did not get any location updates nor the speech output works!

I am using the current beta channel update for Xamarin Studio, Xamarin.iOS, Xcode 6, iOS 8 and Xamarin.Forms.

What should I change to run the app correctly ? I mean, Craig and Steve would have been tested the app in there blog post with the latest Xamarin versions?

Best

Marco