This could be a huge security risk, if the publicly-available data was obtained by enemy intelligence.
When Strava, an exercise-tracking firm, a year ago published a "heat map" of its user activity around the world, it probably didn't expect the data representation to cause a national security scandal-but it has.
The security implication of the Global Heat Map, which was uploaded in November 2017, was publicized by 20-year-old Australian worldwide security student and Institute for United Conflict Analysts founding member Nathan Ruser.
Taking a close look at these areas, users will see that some of them are known US military bases. Strava is being actively being used by military personnel in confidential areas allowing data about top-secret military locations to be discovered.
Strava urged users in a statement to check the firm's website to understand the privacy settings.
The map shows a great deal of activity in the U.S. and Europe, but in war zones and deserts in countries such as Iraq and Syria the heat map becomes nearly entirely dark - except for scattered evidence of activity.
Despite numerous bases being common knowledge, there are also a few that are meant to be a little more covert.
Users can ask themselves, do I really want to share my jogging route with the entire Internet? According to Russer, the map can be used to figure out known military bases.
Air Force Colonel John Thomas, a spokesman for US Central Command, said the US military is looking into the implications of the map. "I shouldn't be able to establish any pattern of life info from this far away", Ruser tweeted. "Recent data releases emphasize the need for situational awareness when members of the military share personal information", said Pentagon spokeswoman Harris.