GPS Week Number Rollover?

[gregd]

Not to start any rumors, or incite a Y2K-level panic, but a curiosity... I wonder if the GPS units in our cars are able to properly process the week number rollover that's coming in a couple of months?

https://ics-cert.us-cert.gov/sites/default/files/documents/Memorandum_on_GPS_2019.pdf

 

[Roadster]

 

[HankLloydRight]

This just popped up again today:

How Does GPS Actually Work and Why Many GPS Devices are About to Stop Working

I have the same question about our internal GPS systems. Sure hope I don't need to upgrade the firmware to fix this "bug".

Oops.. I see this is a Roadster Tech forum. Going to repost to a main forum.

 

[Gizmo74]

Today both GPS, the internal one and the alpine unit are still working normally.

 

[gregd]

Ha. Totally forgot about it... Checking my OVMS, it looks like the car is still in my garage, and the clock is right, so all good here too.

 

[ShawnA]

Hi Guys,

I was double checking some stuff on my Roadster(2.0) yesterday related to TPMS...
It has not been driven for a while...
The clock was off by one hour due to the recent change in DST.
The date was April 25, 2000
Obviously not correct...
Is this part of the GPS problem???
The car is equipped with the single DIN JVC - radio, navigation system.
If anyone has a loaner CD with map upgrades please PM me.

Thank You,

Shawn

 

[slcasner]

The date was April 25, 2000
Obviously not correct...
Is this part of the GPS problem???

Yes, the GPS week-number rollover causes the date to go backwards by 1024 weeks or 7168 days (about 19.6 years).

 

[ShawnA]

Thank you.
How do I fix it???

Shawn

 

[slcasner]

What you need to do is update the firmware in the GPS sensor mounted near the left front wheel. See the discussion in the thread Caution - Annual Service - Car power-down - GPS issue. I have made a cable to facilitate doing this firmware update by connecting to one of the two big cables that plug into the VMS box in the passenger footwell. My intention is to loan out that update cable to any of the other 2.x Roadster owners who would like to use it.