Israel: Engineers at TotemPlus, an Israel-based electronics company, have claimed that continuous monitoring of gyro and speed log in addition to GPS signals could defend ships against GPS spoofing techniques.
Monitoring the dead reckoning (DR), i.e. plotting based on course and speed, is an old and trusted method of sea navigation. TotemPlus engineers say that one of their products called Totem ECDIS is able to continuously monitor gyro and speed log output in addition to GPS signals. If the distance between positions derived from GPS and DR is greater than a value set by the user – a 1-10 naut mile difference is recommended – an alarm will pop up. Once an alarm is raised, users should ascertain position using another method such as radar, from the ‘Toolsnavigation ToolsManual Fix’ menu option. If the GPS is found to be spoofed or unreliable, the primary position device can be switched to DR. A ‘safe period’ should be set, after which DR and GPS can be automatically synchronised. The ‘safe period’ means a long enough period in which normal DR and GPS differences are acceptable and can be accounted for.