Angular google maps - works in ionic serve not in iOS

Hi,

I’ve been following this tutorial on running Google Maps from an ionic app: http://www.joshmorony.com/integrating-google-maps-with-an-ionic-application/

The app works fine in a browser via ionic serve but when running via ionic emulate ios I just get a blank page (after being prompted to allow the app to use my location).

Any ideas what could be causing this or where I can log for troubleshooting? It feels like an iOS9 issue.

Thanks