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GPS about 30m off

Edwin
5 months ago

I have noticed this twice now. After using my GPSmap 67i for a few hours the gps is at once way off.

We went for a little walk this evening to find a cache. The gps worked fine until the last waypoint. We were on the right spot and according to the gps we were 30m away from that waypoint.

In the hurry of that moment I didn't notice the fault right away, but being home in my backyard I see the gps is still way off.

Multi-GNSS is selected and Multi-Band is on. According to the Satellite page  there could be a variation of 1.8m. On the map I can see the gps is at least 30m off.

Switching the device off and on solves it directly. I had the same experience yesterday (not caching or walking at that time, just playing with this new toy at home), so it is not just a one time glitch.

I wonder if someone else has this experience as well and I hope someone can tell me I can solve this behavior by myself.

Regards,

   Edwin.

  • 0 1 day ago in reply to scubajorgen

    As I already wrote above, I have the same problem. The Garmin support told me, that this is a normal behaviour. As I cannot belive that, I talked to my retailer to replace the GPSmap with a new one and he did.

    Then I did the same test with a new GPSmap (without updating - Firmware v6.91) and it worked without problems over some days, no drift!. Then I updated the device to v7.60 and it still worked over a longer period. BUT: after updating it to the current v8.90 I instant had the problem again :-(

    Starting with v8.xx, Garmin also updated GPS firmware version from v2.46 to v11.02. So I think that maybe it is a bug in the GPS firmware?

    Sadly it is not possible (as far as I know) to downgrade the GPS to an older firmware version :-(

  • 0 1 day ago in reply to Chris
    Chris said:
    As I already wrote above, I have the same problem. The Garmin support told me, that this is a normal behaviour. As I cannot belive that, I talked to my retailer to replace the GPSmap with a new one and he did

    I won't accept that (i.e. the response of Garmin) Rage 500 euros down the drain

    Praise your retailer, however the device doesn't seem the problem!

    Chris said:

    Then I did the same test with a new GPSmap (without updating - Firmware v6.91) and it worked without problems over some days, no drift!. Then I updated the device to v7.60 and it still worked over a longer period. BUT: after updating it to the current v8.90 I instant had the problem again :-(

    Starting with v8.xx, Garmin also updated GPS firmware version from v2.46 to v11.02. So I think that maybe it is a bug in the GPS firmware?

    This is really interesting information!

    I find in the release notes from 8.30:

    • Improved GPS Performance.

    That presumably is the culprit then based on the info of Chris.

    Kids, don't try this at home!

    I find on the gpsrchive a firmware archive for the GPSMAP 67, a.o. 7.60

    It contains a manual to downgrade the firmware.

    Manual Updates

    NOTE: Loading older firmware versions will clear all user data from the device (remove micro SD card if present).

    * Download and extract the desired *.GSP firmware update.
    * Rename *.GSP to GUPDATE.GSP.
    * Connect the GPSMAP 67 to your computer and enter MTP Mode.
    * Copy GUPDATE.GSP to [GPSr]\Internal Storage\Garmin\GUPDATE.GSP.
    * If loading an older firmware version, create a force.tmp file in the [GPSr]\Internal Storage\Garmin\ directory.
    * Disconnect and reboot the GPSMAP 67.
    * When prompted to install the new firmware version, select 'Yes'.
    * The GPSMAP 67 will restart automatically after the firmware update is complete.

    Let's see if we can downgrade (until Garmin fixes the issue...).

    The risk may be to brick your device, warranty void, lethal accidents, etc,etc which I am willing to take Smiling imp