BEIRUT -- An interactive map posted on the Internet that shows the whereabouts of people who use fitness devices such as Fitbit also Reveals Highly Sensitive information about the location and activities of soldiers at U.S. military bases, in what appears to be a major security oversight.

Most parts of the United States and Europe, where millions of people use some form of fitness tracker, show up on the map as a blaze of light, because there is so much activity.

Zooming in on those brings into focus the locations and outlines of known U.S. military bases, as well as of other unknown and potentially sensitive sites -- presumably because U.S. soldiers and other personnel are using fitness trackers as they move around.

The Global Heat Map was posted online in November 2017, but the information it contains was only publicized on Saturday after a 20-year-old Australian student stumbled across it.

He started tweeting about his discovery, and the Internet also lit up, as data analysts, military experts and former soldiers began scouring the map for evidence of activity in their areas of interest.