Finnish-based fitness tracking app Polar has temporarily suspended its global activity map feature after last week journalists used it to track down the real-world identities of military and intelligence personnel. The Polar Flow app exposed the user’s past activity, such as running or biking routes, as well as personal details such as heart rate, physical attributes, and more. Polar said these details are shared only based on an opt-in system, and the data exposed via its activity map was willingly shared by only some users, with the vast majority of user data remaining private.
Source: https://www.bleepingcomputer.com/news/technology/polar-app-disables-feature-that-allowed-journalists-to-identify-intelligence-personnel/