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. The result of these tests ensure that our customers have the best information available on this issue. After 1024 weeks had elapsed, this counter rolled over to zero, and GPS time started counting forward again. Lowrance has carried out extensive testing on all current products, all previous generation products and a significant number of legacy products. However, back in 1980, when the GPS system first began to keep track of time, the date and time were represented by a counter that could only count forward to a maximum of 1024 weeks, or about 19.7 years. 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 Week Rollover Problem is a known issue caused by the way that GPS used to handle the week element of the data that forms an essential part of the navigation signal. The Global Positioning System (GPS) has its own date and time scale based on counting weeks, and seconds within a week.
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