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HomeGearGPS Accuracy Concern Impacted Garmin, Suunto, and Polar Watches Over Previous Week

GPS Accuracy Concern Impacted Garmin, Suunto, and Polar Watches Over Previous Week


Over the previous 7 days there’s been a slew of oldsters with sure GPS watches seeing accuracy points, whereby the GPS monitor is offset from actuality (often in a particular course). This typically ends in GPS tracks the place the visible sample is likely to be appropriate, however it’s not within the appropriate location. That means, it’s as if somebody shifted your route barely to the aspect, finally letting you stroll on water, or run by way of buildings. Alternatively, it simply may need bizarre gaps, or be outright dumpster-fire incorrect. In idea, the difficulty needs to be resolved as of final evening.

This situation particularly impacted these with Sony GPS chipsets, which is basically a repeat of a problem that occurred 18 months in the past that was far better reaching (for quite a lot of causes). The primary time, the difficulty occurred over the New 12 months’s Vacation Weekend, and was the primary time these corporations noticed it, which considerably slowed the response price (and likewise, elevated how many individuals it impacted).

This time round, the impression was definitely measurable (as my inbox can attest to), however the length was extra restricted. It initially impacted individuals final Tuesday/Wednesday (June twenty eighth/twenty ninth), then once more over this previous weekend and into the early week (July 1-July fifth). The variety of impacted watches is huge right here, and primarily any Garmin watch launched in the previous few years (however not most of these in 2022, as they use a unique chipset), in addition to all Suunto/Polar watches, and theoretically all COROS watches besides the Vertix 2 (although, I haven’t seen any COROS stories, so maybe they’ve put in place a unique filter).


Roughly talking, that’d be the next watches (plus the 29 million variants of those watches Garmin has):

– Garmin Forerunner 45/245/745/945/945 LTE/Fenix 6/MARQ/Vivoactive 3/4/Venu
– Garmin Edge 130 Plus, Edge 530/830/1030 Plus
– Garmin Enduro watch
– Garmin Intuition Sequence 1 & Sequence 2 watches
– Polar Vantage Sequence, Grit Sequence, and Pacer Sequence Watches
– Suunto 5/5 Peak & Suunto 9/9 Peak

Once more, the above checklist shouldn’t be all-inclusive. There are tons extra watches impacted, particularly from Garmin, which makes use of near-identical watches in varied different divisions such marine, golf, and aviation. Moreover, this could theoretically impression the Wahoo RIVAL & COROS watches (besides Vertix 2), although, I can’t discover any cases of individuals with points there. Which suggests both they have been reported, or they’ve put in place mitigations.

In the meantime, the Garmin and COROS watches not impacted are:

Garmin Fenix 7 & Tactix 7 Sequence
Garmin EPIX Sequence
Garmin Forerunner 255 collection
Garmin Forerunner 955 Sequence
Garmin Edge 1040 Sequence
COROS Vertix 2

All of these watches use a unique multiband chipset from MediaTek/Airoha, which isn’t impacted right here.

The difficulty has to do with the ephemeris information file, additionally referred to as the EPO file (Prolonged Prediction Orbit) or Related Predictive Ephemeris (CPE). Or just the satellite tv for pc pre-cache file. That’s the file that’s delivered to your machine on a frequent foundation (often each few days). This file is what makes your watch near-instantly discover GPS satellites once you go exterior. It’s principally a cheat-sheet of the place the satellites are for the subsequent few days, or as much as every week or so.

Your watch or bike pc mechanically will get this file by way of Bluetooth Good out of your cellphone, WiFi, or USB, relying on the way you join your watch. Most corporations ship it anytime your watch syncs and desires a brand new model. So out of your aspect, you by no means do something – it simply quietly occurs within the background. The info on this file was incorrect, and thus the info your watch makes use of for these first jiffy can also be incorrect – resulting in the offsets.

The excellent news is the repair is straightforward: Simply sync your watch to get an up to date copy. Garmin for instance says that in case your watch is linked to your cellphone, as of final evening, it ought to have/be downloading a brand new EPO file, which can repair the difficulty. Garmin additionally says they’ve put in place blocks to make sure this doesn’t occur once more. Albeit, they stated that 18 months in the past too, so my assumption is no matter Sony did this time broke it in a brand new and particular means that wasn’t the identical as final time.

With that, hopefully that helps of us perceive what’s happening, and the right way to repair it.

Thanks for studying!



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