Choetech wireless charging pad on a motorbike

Hi looking to get the choetech wireless pad to charge my phone when on the motorbike as I can't find a waterproof case big enough to accept the usb c cable going into the phone when the phone is in the case .I have bought a universal sat nav case and need to glue the wireless pad in the case behind the coil on the phone case ,so where is the coil situated in the back cover ,thanks

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