GPS WEEK NUMBER ROLLOVER SOFTWARE
GPS WEEK NUMBER ROLLOVER DOWNLOAD

This is the 2nd week rollover event so – as a general rule – our GPS chipset suppliers were aware of the issue and had this covered in their test and validation plans for more recent chipset designs.Ĭheck the table below to see if your Lowrance device is affected.Ĭlick here to download new software for the HDS (Gen 1).Ĭlick here to download new software for the HDS Gen 2.Ĭlick here to download new software for the HDS Gen 2 Touch.Ĭlick here to download new software for the Mark 4.Ĭlick here to download new software for the Elite 4/Elite 4m.Ĭlick here to download new software for the Elite 5.Ĭlick here to download new software for the Elite 7Ĭlick here to download new software for the Hook 4.Ĭlick here to download new software for the Hook 5.Ĭlick here to download new software for the Hook 7.Ĭlick here to download new software for the HOOK² 9 SplitShot, HOOK² 9 TripleShot, and HOOK² 12 TripleShot. No currently available Lowrance products have any known issues with GPS week rollover.

GPS WEEK NUMBER ROLLOVER SOFTWARE

In cases where we have found an incompatibility we have issued a software update, when possible. It is on the 4th August 2019 at 00:00 AM (UTC) that the week number counters rollover will occur. The week number counters for the GPS in the discontinued models below started their week count from the 19 December 1999. The result of these tests ensure that our customers have the best information available on this issue. The week number counter in GPS resets once every 1023 weeks, which is approximately 19.6 years. Saturday, April 6th, 2019 marked the 2nd time GPS clocks needed to be reset. Lowrance has carried out extensive testing on all current products, all previous generation products and a significant number of legacy products. The WN is transmitted as a 10-bit field to navigation systems and it rolls over or resets to zero every 1,024 weeks.

In extreme cases position may be affected. Typically affected products will still show correct position, but will show incorrect date and time. What is the result of this if my product is affected? The 1024 week counter ran out and rolled over for the first time on August 21, 1999

The upcoming GPS week rollover event is on April 6th, 2019. However, the field that contains the week number is limited to 1024 weeks, a GPS rollover event occurs when this counter reaches week 1023 and then rolls back to week 0.Ībout every 20 years. The Global Positioning System (GPS) has its own date and time scale based on counting weeks, and seconds within a week.

Gps week number rollover