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FR645 wrong GPS data

Hello,

I wanted to ask if someone knows of any solution to my problem. My forerunner 645 is giving me completely false distance and altitude data on every hike I do. I usually do a long hike once per week. The watch will always add more distance. For example I know for sure from multitude sources a hike is 11km long. My watch will measure 23km. Also, I mainly bought this watch because i wanted super precise altitude data and i thought I'll be getting that with the barometric altimeter. And the altitude data will always be wrong about 100m or more. Usually there is 100m missing. It doesn't matter if it's super sunny or cloudy. Always the same.

I tried using GPS, GPS + Glonass, GPS + Galileo. They all give me wrong data. Now i just keep only GPS on because at least it doesn't eat the battery as fast. When I look at the trail map created after the hike the line is usually pretty OK when hiking straight but as soon as there is some zigzagging the GPS goes crazy and the line is all tangled up.

Also the watch does this thing that everytime i move my arm (even when sitting still) it thinks I'm moving and will add distance.

Anyway, anyone with the same problem? Any suggestions on what I might do? I regulary update the watch and I'm using the walk app since there is no hike option.

0 filip.kosut over 4 years ago

Modify record GPS to every second

0 MORTENRICK over 4 years ago in reply to filip.kosut

How ?

0 maratonrunner over 4 years ago in reply to MORTENRICK

Change "Data Recording", see Data Recording

0 Anže over 4 years ago in reply to filip.kosut

I tried this yesterday, everything is still the same. Everytime I stop during my hike the GPS goes crazy and starts adding a lot of wrong distance.

0 jim_m_58 over 4 years ago in reply to Anže

Are you actually pausing the activity? If not, there will be some GPS drift, and while it may only be a few feet at a time, it adds up.

0 Anže over 4 years ago in reply to jim_m_58

No, I am not pausing the activity. I want to see how much time the whole hike took me with all the pauses in the end. Also I can't pause the activity every time I stop to take my breath or take a photo. Those are stops that last 20 seconds - 1 min.

Yeah it adds up to like 40% more distance than it's suppose to be... This is not normal for a watch like this.

0 maratonrunner over 4 years ago in reply to Anže

Forerunner 645 GPS performance is bad. You can or may see this when running in the forest, near buildings (even small one) or in the tunnel (even short one). Sometimes it can drop the GPS connection.