GPS 12 wrong date Garmin

Discussion in 'Garmin GPS' started by ben, Oct 13, 2015.

  1. ben

    ben

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    I know most of you have moved on from the garmin GPS 12 none the less I powered my two 12's up only to discover the "Date Problem". Have tried the resets and no change. Can Anyone help?
     
    ben, Oct 13, 2015
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  2. ben

    Nuvi-Nebie Moderator

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    This sounds like the EOW counter problem, the time / date data sent from the satellites to your GPS is contained in two registers, one counts seconds and the other counts weeks, when the seconds counter gets to the end of a week, it increments the week counter and resets to zero. Originally the week counter only had 10 bits in it so it could only count 1024 weeks (about 20 years) before it resets. The counters started from January 6, 1980 so they went back to zero on August 22, 1999. In later models the week counter was increased to 13 bits so the problem won't occur for 150+ years but that won't help the old models because they can only use 10 bits. Because of the End Of Week counter problem, old units must have a current date no more than 10 years away from the real date, if they don't, they will never display the real date. One fix for this is to set the unit back to factory default, I'm guessing that your 'resets' was doing this, it usually take the form of :-

    1 Switch off
    2 Press MARK and power on together.
    3 When it says "do you wish to delete data" it should default to YES.
    4 Switch it to NO,
    5 then switch it back to YES,
    6 then switch it back to NO,
    7 then switch it back to YES
    8 finally press ENTER

    After the above it will take some time to find satellites again because the unit will 'Cold Start' (no almanac, time, position etc.), if the time remains unchanged or is more than 10 years in the past or the future, there is only one other fix I know of, it involves downloading a GpsEow.exe program onto a computer that is connected to your GPS12 via an RS232 com port, this program will send a new date to your device. I have used this program on a GPS38 unit and it did install a new date that was roughly 1 year into the future, but I have no knowledge about whether it work on a GPS12
     
    Nuvi-Nebie, Oct 14, 2015
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  3. ben

    Alastair Mackenzie

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    Hi there, I have recently sorted the Eow date problem using the Eow software on a Garmin 12XL so I am sure it will work just fine on a Garmin 12. You will need an old pc running Windows XP with a 9 pin serial port and a Garmin computer connection lead. All you need to do is :-

    (1).Download and install the GpsEow software and install on a Windows XP computer.
    (2.) Open the software on the PC.
    (3.) Connect the GPS to the computer using the serial port.
    (4.) Switch on the GPS and make sure the interface setting is set to Garmin to Garmin.
    (5.) On the computer screen - click on the Upload time button.
    (6.) A message will appear on the computer screen confirming that the time has been uploaded.
    (7.) Switch off the GPS and disconnect lead. Switch back on.
    (8.) Go to the date page where you should find the date is now incorrect but some date in 2016.
    (9.) Take the unit outside where there is a good view of the sky. It should pick up the satellites and as soon as it gets a 3d fix (minimum 4 satellites) the date will be corrected to the correct time and date.

    Hope this helps you out. If you need a link to the GpsEow software let me know.

    N.B. Don't forget to change the GPS interface back to NMEA if you need the GPS to talk to a data logger.
     
    Alastair Mackenzie, Oct 15, 2015
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  4. ben

    mlaajanen

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    Hi

    Just downloaded the program to fix the week problem which causes by 12XL to stay on 1996 and now it is back on track :) And the best wityh GPS12 is its current consumption, 50mA at 12VDC is really great in sailing boat :)
    Wish there where some way to fix the small isues with the LCD display aswell!!

    Thanks Nuvu-Nebie! DSC_0049_1.jpg says 2016 :)
    DSC_0048_2.jpg
     
    mlaajanen, Mar 13, 2016
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  5. ben

    Simon Templar

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    Location:
    Infinite Rider on The Big Dogma
    No surprise.....once again, us Mac types are left out in the pre-Y2K cold.


    ....sT
     
    Simon Templar, Mar 16, 2016
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