Globalstar satellite transmissions used for tracking truck fleets and wilderness hikers can be hacked to alter messages being sent with possibly dire consequences for pilots, shipping lines, war correspondents and businesses that use the system to keep an eye on their remote assets.

The technique, described at Black Hat 2015, can’t affect control of the Globalstar satellites themselves, just the messages they relay, but that could mean altering the apparent location of assets the system tracks. So a cargo container with a satellite location device in it could be made to seemingly disappear, or an airplane could be made to seem to veer off course, according to a briefing by Colby Moore, a security staffer at Synack.

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