UPDATE DIRECT FROM FURUNO REGARDING GPS ROLLOVERS AND EQUIPMENT FUNCTIONALITY FOR 2021.

As you may be aware, the Global Positioning System (GPS) has its own date and time scale for expressing satellite positions. The system is based on counting weeks and seconds within a week. The legacy GPS navigation message has a ten-bit parameter that represents the week number. Consequently, the week number parameter in the GPS navigation message has rolled over to zero every 1024th week since 6 January 1980, with the next week rollover occurring 6 April 2019. 

In anticipation, we have examined the SAAB products that are or have been in production. 

The following is to be observed:  

AIS/GPS/SATC models that support automatic changeover to the next 1024 weeks. 

  • GP170 – Date unknown, not urgent. 
  • FA170 – Date unknown, not urgent. 

All Felcom models use external GPS unless an add-on GPS board kit has been installed. 

AIS/GPS/SATC models that can be software upgraded to support changeover to the next 1024 weeks – currently none.  

AIS/GPS/SATC models that cannot be software upgraded to support changeover to the next 1024 weeks – and requires new equipment:

  • GP90 – Expected to fail, if no action is taken before GPS roll over 20/06/2021. Some will be affected by 02/01/2022. 

It is the type of GPS core module in the device that defines when the equipment will be affected by the roll over. By running the self-test, the unit will display GPS program no. (Press “MENU ESC” followed by “8” to display self-test) GPS Program no. 4850237*** and 4850238*** = Rollover 20/06/2021 If GPS Program no. differs from above = Rollover 02/01/2022

  • GP150 – Expected to fail, if no action is taken before GPS roll over 02/01/2022. 
  • FA100 – Expected to fail, if no action is taken before GPS roll over 20/12/2020.
  • FA150 – Expected to fail, if no action is taken before GPS roll over 02/01/2022. 
  • Felcom-12 with GPS board kit – Expected to fail, if no action is taken before GPS rollover 17/03/2019 
  • Felcom15/16 with GPS board kit – Expected to fail, if no action is taken before GPS roll over 20/12/2020

Contact E-Touch Navcom today for any questions or assistance with verifying the compatibility of your existing equipment

support@etouchnav.com