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20 years w/ Garmin devices and never had this happen. GPS on Forerunner 255 way off.

Running a 4-mile route I've done a hundred times. 2nd mile my pace was showing much slower, and the watch marked the mile further than it should have. 3rd mile even worse. Checked the route afterwards and the map of my route is nuts. Anyone else had their Forerunner 255 GPS go haywire?

My Edge for my bicycle has sometimes shown me slightly off course but nothing like this.

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0 ovekvam 8 months ago

Maybe someone switched on a GPS jammer nearby. Some people use these illegal devices to avoid being tracked.

0 MCCLURE28216 8 months ago in reply to ovekvam

If that's the case, I hope it was just in the area temporarily. I had never heard of this but now I'll be worried my workout recordings will be interrupted. Even worse if it happens during a race.

0 RDW 8 months ago

What GPS settings are you using? Auto, multi etc?

0 MCCLURE28216 8 months ago in reply to RDW

I accidentally clicked an option when accessing the setting. Pretty sure it was set to Auto. I've set it to "All + Multi-Band". Hoping that's the most accurate.

0 Lewis 8 months ago in reply to MCCLURE28216

the most accurate as Garmin sais is "Auto" this uses SatIQ a method that improves efficiency and efficacy

0 1161517 8 months ago in reply to Lewis

No. Auto / SatIQ is said to have the best balance between accuracy and efficiency.

All + Multiband however has the best accuracy. That is also what SatIQ is switching to when needed (e.g. with high buildings surrounding you). In less demanding situations it is switching off multiband and thus saving energy.

0 MCCLURE28216 8 months ago in reply to 1161517

I ran the same route today with no issues. Either "All + Multiband" fixed it or there really was a GPS jammer nearby yesterday. Crazy if that was true.

0 Former Member 8 months ago in reply to MCCLURE28216

Solar flares/space weather, adverse atmospheric conditions, rain, reflections, can all play a role. I use all+multiband always on a 955, but also use a Fenix 6X at the same time. The 6X made a terrible track last week (Nov. 21), there was no bad space weather (www.spaceweatherlive.com/.../archive.html), just a lot of rain. But the 955s track was perfect (so no GPS outage or disturbance) I think All+Multiband is very, very good.