Thank you for using Apple Support Communities!
I understand from your post that you would like another maps app to be your default map app. Resetting your Location Services may help and allow you to choose another maps app of your choosing. The following article has information on how to reset your Location Services:
About privacy and Location Services in iOS 8 and later - Apple Support
Best Regards.If you would like to reset all of your location settings to the factory default, go to Settings > General > Reset and tap Reset Location & Privacy. When your location and privacy settings are reset, apps will stop using your location until you grant them permission.