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What are the options for external GPS on Iphone? For instance, my car have an excellent external GPS antenna (and a terrible inside reception due to the heater in the windshield) and I can retrieve the GPS data using an Arduino/Raspberry from the OBD2 port. I do not want to fake the GPS data but use an external data source such as Bad Elf/Garmin Glo/etc. Is it that possible? Would the apps use the external data automatically such as Google Maps and Waze? I'm not interested in distributing an app unless needed, so, anything like a profile works for me.