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1030 GPS accuracy very bad

Former Member over 7 years ago

I've been comparing the GPS accuracy of my 1030 with my previous 1000, a friend's 1000, and my wife's Explore 1000, and the 1030 is by far the worst of the three. The 1030 is using current 3.90 FW and the 1000 and Explore 1000 also have whatever their current FW is. I have GPS accuracy setup as one of the data fields on the screen, and the 1030 will be claiming 3m accuracy while the track it is showing/recording is up to 50m out. I exported some GPX traces from the various GPSs for a a couple of rides where we were riding together, and uploaded them to openstreetmap.org to compare. Here are links to some screen dumps to show what I mean - all screen dumps show the scale at bottom left:

Trace from friend's 1000: https://photos.app.goo.gl/IzyVZVmFaIpwemvn2

Same section of road from my 1030 on the same ride - the trace is about 50m out, though the 1030 was indicating 3m accuracy: https://photos.app.goo.gl/PGnQIBOR96h5BYcJ3

Trace from wife's Explore 1000 (we're riding on the yellow road, Phillip Ave): https://photos.app.goo.gl/onh0uNG5irLk0nuB3

Same section of road from my 1030 on same ride: https://photos.app.goo.gl/78JQUiwoRz0gDw842

Frequently, if I have a course loaded and am navigating it, the GPS accuracy is so far out that the 1030 tells me that I'm off course, even though I'm riding on the correct road. And all the time it's telling me that its accuracy is 3m.

Nick

0 PBradbury over 7 years ago

Nick,
Just an observation, both the examples show an east-west difference, but nothing significant north-south.

Cheers, Peter

0 Former Member over 7 years ago

Yes, I noticed that too. Here's another example - North is up. Every time the route is approximately East-West it's pretty accurate, but every time it's North-South, the accuracy deteriorates: https://photos.app.goo.gl/dJ5c1tOA20FmuO4Y2.

Nick

p.s. I'm putting the images as links because the forum software isn't allowing me to upload them. Every time I try I get "Invalid file" error, for both jpg and png files.

0 Former Member over 7 years ago

I've just got back from first major ride with the 1030.
Day one of a 3 day ride. Fisrt day its a posted 30km uphill, it recorded 26km. Next day a known 40km ride, it recorded 36km.
Screenshot below shows me on north side of river.Track always on the south side.
It meant my strava sement didn't match any others on the ride.
Hope FW fixes this soon, should not be so bad on a new, expensive piece of kit.
ciq.forums.garmin.com/.../1323037.jpg

0 RVASSEN over 7 years ago

- 3m accuracy and three bars of GPS signal being indicated,

That's a bug. The accuracy datafield always displays 3m, no matter what the real GPS accuracy is.