Instances of significant GPS interference have been reported worldwide in the maritime domain. This interference can result in lost or inaccurate GPS signals affecting bridge navigation, GPS-based timing, and communications equipment (including satellite communications equipment). Over the last six months, an area in which multiple instances were reported was the Strait of Hormuz.
Additionally, Automatic Identification Systems (AIS) are open, unencrypted, and unprotected radio systems intended to operate on non-secure VHF-FM channels. As such, AIS signals can be spoofed, resulting in incorrect or missing AIS data.
Exercise caution when underway and prior to getting underway. The U.S. Coast Guard Navigation Center (NAVCEN) and NATO Shipping Center websites contain information regarding effective navigation practices for vessels experiencing GPS interference.
The information reaffirms safe navigation practices when experiencing GPS interference, provides useful details on reporting disruptions, and is intended to generate further discussion within the maritime community about other disruption mitigation practices and procedures.
This document also recommends reporting such incidents in real time.
AIS devices do not inherently have a virus or malware protection, so cyber security best practices against hacking should be adhered to if you connect your AIS to a network or update it using removable electronic devices (e.g., USB drives). AIS, while an invaluable situational tool, should never be solely relied upon for collision avoidance or navigational decision-making.