![]() Review and update standard operating procedures and business continuity plans for how to react and report any disruption of GPS equipment or alarms in your systems that indicate a GPS anomaly or loss of signal.Contact manufacturer (or review its website) for recommendations to update firmware, software or HARDWARE, as needed.Determine the manufacturer, make, model and if any were built before 2010.Take an Inventory of where GPS receivers are found in your operations and systems.Since this occurs nearly every 20 years, CISA recommend that you take these steps to be operationally resilient to any effects of the NWRO.If you have questions about a specific receiver make and model particularly older than 10 years, DHS recommends that you should contact your manufacturer for further guidance. Manufacturers have been testing their equipment and issuing service bulletins. DHS issued the initial advisory in April 2018.Devices that conform to the Interface Control Document (current is J) should not be affected. The GPS Week Number Roll Over (WNRO) is a standard design feature of GPS.The most important step that individuals and organizations can take to prepare for the April 6th rollover is to ensure that all devices using GPS have up-to-date firmware or software. How do I Prepare for the GPS Week Number Rollover?Īccording to the GPS Innovation Alliance, GPS-enabled equipment with current firmware should experience no issues due to the rollover. The good news is that with the modernization of GPS the week number counter will be increased to 13 bits and we will not have another event like this for approximately 157 years. On April 6, 2019-the first Saturday in April-the GPS week counter will reset to zero. That week counter uses 10 bits and needs to be reset every 1,024 weeks-roughly every 20 years. GPS uses a week counter that enables receivers to calculate the appropriate date. Because of its low cost and universal availability, The Global Positioning System (GPS) has become the standard time keeper for many commercial users across the globe. An accurate accounting of time is of critical importance to nearly every modern organization.
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