Re: GPS Week number rollover bug issues?

Randy Love

About the GPS rollover bug, the document says that it happens every 1024 weeks, starting from 1 January 1980 0000z. So,  this has happened once already, around 21 December 1999. The Y2K bug was all the rage then, but I don't recall widespread GPS issues. The upcoming April 2019 rollover probably won't be an issue either. 

The document specifically comments on deriving time from the signals, not location information. It would seem if there would be a location issue, it would only be during the exact millisecond of the rollover, and would self-correct within the next few seconds. Non-critical for most civilian use.

So, unless you're using a GPS to control multimillion dollar stock trades that faithful moment in April 2019, you should be fine. 

But, then again, I invoke the Dennis Miller clause here. "That's just my opinion. I could be wrong."

Awaiting the GPS apocalypse of 2019, 73.


On Tue, Feb 19, 2019, 8:00 PM 'Lynn W Deffenbaugh (Mr)' kj4erj@... [aprsisce] <aprsisce@... wrote:

Are you sure that you have unzipped the APRSIS32.EXE into a newly created empty directory?  The symptom you describe could be the result of simply double-clicking the .EXE from within a .ZIP viewer.  Please also watch the excellent video by G4ILO on the Wiki at:

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 2/19/2019 6:19 PM, n4asx@... [aprsisce] wrote:

I have a WINDOWS 10 computer and when I try to install APRS SI it get a block of white on the middle of the screen and cannot adjust it.  My computers are 64 bit machines.  Any idea what I’m doing wrong.

73 Rick



From: aprsisce@...
Sent: Tuesday, February 19, 2019 5:37 PM
Subject: [aprsisce] GPS Week number rollover bug issues?



Hi All,
I use my Kenwood D72A and D710A with APRSIS32.  I have been reading a lot more recently about the GPS week number rollover bug (see link below from the Dept of Homeland Security or Google this if you are not aware of this).  I have contacted Kenwood and K6VHF, the manufacturer of the aftermarket GPS unit for my D710 and Kenwood but so far there is no information yet available.  I have other units from DeLorme, Garmin and again, little info is available.  I have tried to contact manufacturers and update the firmware on my devices but I now have so many GPS devices in so many places that I am likely to overlook some until they are deployed in the field.  Wh at preparations are you taking for this if any?  I use and have used APRS and GPS to coordinate and support search and rescue activities, boy scout adventures, ARES RACES activities, off road vehicle navigation, nautical navigation, hiking, backpacking etc.. and am not sure how likely this is to cause problems.  My brother in law is a pilot at American and has received conflicting information.  A lot of the legacy navigation systems in small planes have the potential to be affected.  It could be a lot of concern for first responder agencies and ARES RACES units if their equipment or public users equipment goes out.  This may be more hype like Y2K or it could cause a lot of headaches and problems for people given how ubiquitous GPS systems are in our lives.  What have you heard?  What preparations are you taking?  Thanks.
Anthony Mascola


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