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Inaccurate gps tracking after update 12.23 on FR 955

Alexander over 2 years ago

Hi guys!

After update 12.23 gps track has been disappointingly inaccurate.

Before update gps track was incredibly smooth!

What do you think?

Maybe opaque autumn clouds?

On pic below: after update and before.

Top Replies

Garmin-Kevin over 2 years ago +1 verified

All,

After reviewing the information provided (in this thread and via email) by many of you, I am having a difficult time finding examples of when the watch is recording a GPS position outside of the 3…
Garmin-Kevin over 2 years ago in reply to Garmin-Kevin +1 verified

In addition to my comment below, we would like to know if any of you are experiencing the symptoms mentioned in:

Not maintaining GPS Lock in GPS Only mode

If so, please comment on that thread.

Garmin-Kevin…
Garmin-Kevin over 2 years ago +1 verified

All,

We have had various GPS improvements since the 12.23 update. After updating to 13.15 (which is the current beta software), are any of you seeing GPS issues either during your recorded activity or…
5369600 over 2 years ago +3

Then I’m not crazy. I am losing my mind, to understand, as it is possible, that a watch of this kind, does worse, than a watch, much cheaper and with less GPS systems! Today I tried again, with all systems…
StefanHH over 2 years ago in reply to StefanHH +2

Hi Kevin, after updating to 13.21 nothing changes:

Run on 22.11.22 at 19:08 SW:13.21 GPS: Smart; GPS-mode: auto-select, Problem at Minute 1:30-2:00

https://connect.garmin.com/modern/activity/10020434…
5994630 over 1 year ago in reply to th3oretiker_ +2

I suspect we're seeing two different things here.

There is undoubtedly GPS jamming in evidence in the tracks recorded in Moscow. They're accurate until they pass close to certain landmarks, then become…

All Replies

0 Alexander over 2 years ago in reply to 5369600

Other examples

0 5369600 over 2 years ago in reply to Alexander

Wooooow! Garmin! You see that?!

0 3064576 over 2 years ago

So given that FW12.23 has broken Sync for a lot of people...and some people complain that GPS sync is very slow now. Is it possible that CPE updates are broken or not syncing? This would explain both bad sync times and the reduced accuracy (the data the watch downloads from the actual satellites isn't as accurate as in the CPE file).

0 Former Member over 2 years ago

I just did a 6k run with FW12.23 and for me the gps accuracy is spot on at first glance. Before I started the run, I waited till the GPS signal was there and green. This took about 15-30sec.

0 5369600 over 2 years ago in reply to 3064576

I did an update, even with garmin Express, directly with the pc. So that, those files, must be updated.But even with this the track is not precise

0 5369600 over 2 years ago in reply to Former Member

The signal’s picking up really fast. I also wait a minute, after it turned green, to have more satellite accuracy, but nothing changes

0 rklyukin over 2 years ago

after upgrading to 12.23 gps track got worse! Garmin-Kevin please create a ticket!

0 Mauricewal over 2 years ago in reply to Former Member

I did some tests and with GPS on auto the GPS fix is fast (max 15 seconds) and the accuracy isn't different.

0 alexwhittemore over 2 years ago

I can't help but notice you're located in Moscow. It's entirely possible, likely even, that you're suffering from deliberate state-sponsored GNSS disruption. Activity of that disruption may be different at different times simply based on perceived threat level.

It's well-established fact that Russia (and likely others) actively jam GNSS on a regular basis. https://www.rtl-sdr.com/mapping-gps-gnss-interference-through-ads-b-data/

John Wiseman has a website where you can actively look into where jamming/disruption is happening based on reported ADS-B data from planes flying, but I can't seem to find the address at the moment. Here's an example though: twitter.com/.../1544031843522973696

EDIT: Ha, it's in the image! gpsjam.org.

Indeed, today looks pretty hot in Moscow: https://gpsjam.org/?lat=57.95751&lon=45.45996&z=4.0&date=2022-09-02

I wouldn't expect ideal GNSS performance where you are from ANY vendor, any time soon.

0 alexwhittemore over 2 years ago in reply to alexwhittemore

Alexander what day did you record that really good looking track? 8/21, 8/16, 8/14, 8/8-10 were all a bit quieter on jamming in Moscow, and just prior to the update. Of course, any time of day it could happen to be turned off for the moment.