The Maritime Executive newsletter has a story this week of some truly strange anomalies going on with the worldwide AIS system aboard ships and boats of all kinds as well as fitness trackers and other GPS receiving devices. In some instances, AIS is reporting ships or people thousands of miles from their actual locations and in some cases the signal is showing the ships steaming is huge circles. No one is sure what is causing these anomalies but there is suspicion that hackers have got intot the AIS system and are “circle spoofing” shipping companies and other. Read more here.