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The Pentagon is scrambling to figure out the operational security ramifications from the news on the weekend that fitness devices could be giving away the location of some of its secret bases.

An interactive map found online can show the locations and activities of people who use fitness devices such as Fitbit, raising security concerns about soldiers and other people who are at U.S. military bases in sensitive areas, the Associated Press pointed out in its article.

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The Global Heat Map, published by the GPS tracking company Strava, uses satellite information to map the locations and movements of subscribers to the company’s fitness service over a two-year period, by illuminating areas of activity, AP added.

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 almost entirely dark — except for scattered evidence of activity.