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.
A closer look at those areas brings into focus the locations and outlines of well-known U.S. military bases, as well as other lesser-known and potentially sensitive sites — possibly because American 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 recently.
The data could provide information to someone who wants to attack or ambush troops, the Post reported.
Military officials are looking into the situation to determine how to respond.
“DoD takes matters like these very seriously and is reviewing the situation to determine if any additional training or guidance is required, and if any additional policy must be developed to ensure the continued safety of DoD personnel at home and abroad,” Maj. Audricia Harris, a Defense Department spokeswoman, told The Associated Press.