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Hi.. I've not been able to to get a compass or star chart app to work on my Z.. UK unbranded with .423 ..
Anyone got them working on theirs.. They we're not working before the update either.
go to
settings > location services > access to my location > turn it on > also select GPS and Google's location service
Cheers mate, but it was even simpler..my cover has a magnetic clip to keep it closed.. Took phone out of the cover and all's good 
I'm glad you figured it out