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Old 02-22-2019, 11:09 AM   #1
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Is Your GPS Ready for the April 6th Week Rollover

I just came across this posting on another forum today. I had not even heard about it before this! I just talked on the phone to Raymarine support, as my equipment is late 1990's early 2000 vintage (the boat is a 2002 model). The tech stated they were "testing and did not yet know the total impact and that they would be posting information on their website soon". I don't know about you, but isn't that a little bit late, especially since this isn't the first time (1999 was and not the Y2K thing but the GPS issue) this "rollover" has happened.

If you have older (older than just a few years old) MFD and GPS you might want to look into this with the manufacturer.
The post I found:
"Older satnavs and such devices won't be able to use America's Global Positioning System properly after April 6 unless they've been suitably updated or designed to handle a looming epoch rollover. GPS signals from satellites include a timestamp, needed in part to calculate one's location, that stores the week number using ten binary bits. That means the week number can have 210 or 1,024 integer values, counting from zero to 1,023 in this case. Every 1,024 weeks, or roughly every 20 years, the counter rolls over from 1,023 to zero. The first Saturday in April will mark the end of the 1,024th week, after which the counter will spill over from 1,023 to zero. The last time the week number overflowed like this was in 1999, nearly two decades on from the first epoch in January 1980. You can see where this is going. If devices in use today are not designed or patched to handle this latest rollover, they will revert to an earlier year after that 1,024th week in April, causing attempts to calculate position to potentially fail. System and navigation data could even be corrupted, we're warned."

https://ics-cert.us-cert.gov/sites/d...n_GPS_2019.pdf


Just an FYI in case, like me, you had not heard about this.

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Old 02-22-2019, 11:28 AM   #2
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Thanks for posting. I have newer Raymarine units.......
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Old 02-22-2019, 11:55 AM   #3
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Whoa!! Thanks, firehoser (I guess). Guess I need to research my ancient (8 year old) Garmin radar/plotter in this context.
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Old 02-22-2019, 01:24 PM   #4
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Reminds me of "Y2K".......
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Old 02-22-2019, 02:03 PM   #5
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Talked to a local computer/marine electronics guy - I really don't know if he's a reliable source or not. He seems to think this is all about not having the correct day/date on files but not an issue with actual navigation usage.

The doc referenced by firehoser, above, indicates to me (a very lay reader) that there is a potential impact.

Can one of our TF gurus reduce this to English for the benefit of the great unwashed like me?
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Old 02-22-2019, 02:18 PM   #6
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Just checked the Garmin marine site......They seem to think the rollover won't be a problem IF you have the latest software version loaded.

I recently downloaded the new SW version for my 7215 when troubleshooting a autopilot issue......Guess I better install it before April!
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Old 02-22-2019, 02:42 PM   #7
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Quote:
Originally Posted by greysailor View Post
Just checked the Garmin marine site......They seem to think the rollover won't be a problem IF you have the latest software version loaded.

I recently downloaded the new SW version for my 7215 when troubleshooting a autopilot issue......Guess I better install it before April!

I guess for now, I will have to take a "wait and see" approach. For equipment of my vintage (16-17 years old) Raymarine does not even list it on their "legacy" components page..... therefore no updates even shown. I bought the boat in late 2016 and have no idea when the last update was done. Could be trouble????
Good thing I just bought a new laptop with (new) Coastal Explorer, a new AIS, and a new GPS puck (for the laptop)!
However, I still hope the old "stuff" will work.
From what I read, and my "limited" understanding of it, this could be a problem for anyone actually out on a cruise when the rollover occurs and they are using equipment that is either not up to date or older equipment? Don't panic, I am not sure about that? Best advice, check with your equipment's manufacturer (at least their website) if you have any concerns.
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Old 02-22-2019, 02:58 PM   #8
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Makes you wonder if all the other GPS receivers are going to have a problem. I have one of those little receivers plugged into my all in one computer for navigation. Will be interesting to see if that's affected.

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Old 02-22-2019, 03:08 PM   #9
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I guess for a backup, I better put fresh batteries in my old RDF!
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Old 02-22-2019, 04:57 PM   #10
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Quote:
Originally Posted by greysailor View Post
Just checked the Garmin marine site......They seem to think the rollover won't be a problem IF you have the latest software version loaded.

I recently downloaded the new SW version for my 7215 when troubleshooting a autopilot issue......Guess I better install it before April!


After Garmin said “we will know when the problems start occurring” I then asked them if they would like me to post that on social media.

He then went and asked an engineer and they said that for model years after 1998 that there should be no issues as long as the firmware has been kept up to date.

They do have a service bulletin for their aeronautic equipment saying there are no known issues and why should operate correctly.

Now we wait ;-)
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Old 02-22-2019, 06:55 PM   #11
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The non-technical translation is “something might happen on April 6th, but we don’t know”. Stand by, and be ready to drop the anchor :-)
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Old 02-22-2019, 08:51 PM   #12
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I think you're on to something TT.
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Old 02-22-2019, 09:12 PM   #13
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My trusty GPS is a very old Garmin, maybe a 128. It is too old to have "firmware" so maybe will avoid the impact of the "rollover". I think it has a date, but I think the date is read from the satellite. Will watch for it to let out it's smoke when I fire it up after April 6.
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Old 02-22-2019, 09:49 PM   #14
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According to Furuno, it’s March 17. Scratch head! Or is it scratch heading?

https://www.furuno.co.jp/en/news/not...53&dispmid=965
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Old 02-22-2019, 11:50 PM   #15
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This is the 2nd epoch so presumably any unit designed since 1999 wouldn't have a problem. I doubt any marine navigation unit would use timestamp info so I don't plan on throwing my older garmin or raymarine instruments overboard.

(not that I'd notice as I usually rely on ipad/navionics)
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Old 02-23-2019, 01:40 AM   #16
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All you lose is the date. My old Furuno is dead accurate but it reminds me that it it thinks it is 1999. Annoying but somewhat nostalgic. If your GPS loses its mind, buy a new one. Less money than a pump...
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Old 02-23-2019, 02:10 AM   #17
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Quote:
Originally Posted by JDCAVE View Post
According to Furuno, it’s March 17. Scratch head! Or is it scratch heading?

https://www.furuno.co.jp/en/news/not...53&dispmid=965
Thanks for that link Jim.

I have a Furuno GP 30, even older than the GP 31 they list. The date has been incorrect, and there is no way to change it. I had no idea why, I thought it should get the time and date from the satellites, but it did not bother me. Thanks to the link I now know why - obviously a 1999 date rollover hiccup. The Furuno reset process is a reboot. I turn it off when back at the dock, so it gets a 'cold start' before every trip. It works perfectly wrt position. ie same lat/long as the other GPS devices.

So your GPS may not need to know the date to work just fine. Being retired, more often than not I don't know the date either, and I continue to work just fine as well.
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Old 02-23-2019, 06:28 AM   #18
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"I guess for a backup, I better put fresh batteries in my old RDF!"

Warm up the Loran , and dig out the old Consolan chart if you go offshore.

Should GPS worldwide go down , (an EMP would do it) paper charts and a recording depth sounder might be easy to live with for the next decade or so.


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Old 02-23-2019, 09:03 AM   #19
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Here's a link to the GPS WNRO from the US Naval Observatory

GPS Week Roll Over Issue - GPS.gov

Clicking on the link will download a PDF
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Old 02-23-2019, 09:19 AM   #20
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Originally Posted by JDCAVE View Post
According to Furuno, it’s March 17. Scratch head! Or is it scratch heading?

https://www.furuno.co.jp/en/news/not...53&dispmid=965
As usual JD, you're right on top of things. I forwarded to my instrument guy, a Furuno disciple, for his input. I'll let you know his thoughts.
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