ASUS ME176CX: How can I use GPS without using Google and without using WLAN ???

Hi,

I tried to switch on Location, mode "GPS only" with no success.
Is this GPS thingy of this tablet functional or dead in general?

What else should I try to get my GPS location and not telling it anyone else
(read: No Google tracking)?

Thank you very much in advance for any help in advance!
Best regards,
noriatell

PS: Tablet is rooted, xposed, has the unsigned bootloader/TWRP and is running UL-K013-WW-12.10.1.36

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