Simple lightweight gps module, APP integration for all mobile OS?

Question

satellite navigation

Hello, I am developing task for the mobile application. Monitoring of clients on the ground is needed, a similar function is "a child under supervision." The only difference is that our user will not only know but also manage his tracking. Connoisseurs, and now I ask for your attention, we want the device OS to NOT KNOW about tracking and authorized and unauthorized attempts to exchange geodata with other installed and basic tools be controlled by the user and the application. What can you advise?
Thank you for your attention and my best wishes.