asked this on May 01, 2012 01:37 AM
I normally use my Garmin for route tracking, but on a few rides (mainly commutes) I use the app on my phone. It normally tracks fine, but on my run home last night I got some route drift, and didn't pick up a few segments.
On ride http://app.strava.com/activities/7641565 you can see where the tracking doesn't follow the road. Is there a fix?
I see similar drift on my iOS app - I didnt really notice it until someone I ride with setup a Suffervision display. I was all over the place and the other two riders stayed on track. Only once have I noticed that it was bad enough to miss a segment.
Im in the same boat, and im so happy with myself because thanks to this wonderful app i can finally ride at 50mph.
It looks like i enjoy random riding around my woeks car park before i ride home, i came so close to going premium just to say thank you for a what was a wonderful app, im so glad i didnt
Heres the ride
Just had this happen to me on a run today - really bad. It's a 4 mile loop and Strava indicates that it was 6.8 miles. I'm inclined to ditch strava for other alternatives if they cannot fix this soon...
I think its more related to the underlying OS/GPS ... I see similar drift and inconsistencies with other iPhone GPS apps. Might help if Strava could take more/less coordinate measures per second. It is frustrating... I just had a big PR for a 10K run. I know that the time is right but the distance is all screwy ... would love to see my lap times.
Happened to me on a ride when I had some serious PRs. Now I don't know if the speed or power is correct. :-(
This is a recent phenomenon. It has only been an issue on my last 2 rides really. I don't know what is going on but I am out 3 PR's and likely KOM's because of iPhone GPS drift. I just don't know why it is happening all of a sudden. For us road riders, there should be a way to manually correct drifted segments- the time would remain the same but you would actually be on the road/segment. It is really frustrating when you've just hammered a competitive KOM and blown away you buddy's times and you don't get credit for it.
Here is the ride....look at all that drift! http://app.strava.com/rides/12797267
There should really be feature like RunKeeper has. On RunKeeper you can go back and edit a map the may be messed up. I had the drift happen horribly on Saturday.
I'm having similar issues but mainly with the running app. I'm trying to get in something resembling "not terrible shape" and will do a bit of a run (more like a stagger) to, around, and back from a small lake nearby. Total round trip is about 1.8 miles.
I just got back from one of these staggers, cutting off the last .2 miles (calves were staging a popular uprising) and paused/finished the run in the app. Get home and look it up on the dashboard - 2.3 miles! And the map of the route is this crazy zig-zag to-and-fro, especially the lap around the lake - the route shown is a fair distance farther from the lake, and not all that close to the actual path.
It's odd because previously, the running app was pretty solid, as far as the GPS data gathering. I'm not doing anything different - fire up some music on the phone, fire up the running app, shove phone in pocket, and stagger off. There has been an update or two lately, so I have to wonder if GPS-related bugs have gotten introduced.
I have this problem on my Android also. Yesterday, it ended my ride about 5 miles early, and the route seems to have short-cut through a lot of back yards and through corn fields instead of following the roads. And I'm not enjoying the side benefit of doing apparent 20+mph averages or exceeding 60mph like some of you have. Instead, I'm averaging around 14mph. I'm slow, but not that slow.
What I don't know is whether it's the app's fault, or whether my Android GPS is faulty, since this phone (Samsung Galaxy Stratosphere) has given me troubles in other areas.
Yebbut, GPS is just coordinates. It shouldn't care whether said coordinates, all lined up, match a road or whatever. The geography is immaterial.
And that doesn't even enter into things when the routes being recorded are completely schizophrenic - sometimes showing zig-zagging back and forth.
I have discovered that what is happening (apparently) in my case is that the GPS goes to sleep for a while, and when it wakes back up it draws a straight line to the point where it wakes back up. So if I've traveled several miles and changed direction, it creates an "as the crow flies" line directly to the next point. Not sure if this is a flaw in the app or a flaw in my phone/GPS. Any similar experiences? Would love to know if I need to change apps or change phones. (I have had similar problems with Map My Ride so I'm inclined to think it's my phone.)
OK, so after much searching I found this on the iPhone support forum. I did it and it seemed to work great for me!
"Okay, so I spoke to Apple today. Apparently there is solution, I tried the following steps that they instructed me to do and so far so good. My TimeZone is still incorrect but apparently they are sending out updates to all network providers to solve this issue.
Here's what they told me to do.
Double tap the home button. This will bring up a grey bar along the bottom of the screen showing all you apps that are currently running. Hold your finger on one of the app icons until they start to wobble! When they start wobbling they'll have a red circle in corner. Tap the red circle on all of them to shut them down properly.
Then go into settings and turn on airplane mode. When you've done that go to settings, general, reset and choose reset network settings (you will need to re-enter your wifi passwords!)
Once your phone has reset go to settings, location services, turn it off then on again.
Then go settings, location services, system service, set time off! This should correct the issue, not sure if it's a permanent fix but mines been ok for hours now!
He said if this didn't resolve it then give it a couple of days as they are sorting settings with network providers!
Let's hope it works for all and that they are doing what they said!
Good luck all
Ps. Hope instructions made sense!"
I hope this handles the drift for everyone,
Same thing happened to me, and the drift made me lose a segment I seriously crushed today. Can someone from Strava chime in and let us know if minor drifts can be manually adjusted on the map so the segment isn't lost?
I'm an Android user, and I found that route drift was apparently linked to the specific device I was using, not to the OS. I had a Samsung Stratosphere (3 of them actually) and all of them gave me terrible route drift on virtually every ride. I switched to the LG Lucid and it maintains the routes perfectly. So it could be a device issue, not a software issue.
I feel your pain @Carson Poe. I lost a segment last week that I absolutely hammered. But my case was operator error. Let my battery die on me. Duh.
Ive used this a couple times to fix my route - http://strava-tools.raceshape.com/snap/
Hello everyone - Thanks for all your great comments and feedback about GPS drift and inaccuracies with the iOS App. Here are a few notes:
1. It is always a good idea to contact us directly if a segment cannot match your activity. We have a tool where we can try and force the segment to match your activity if the endpoints line up. This is a good first step.
2. If your GPS data does not line up with the start or end of a segment that is missing from your activity, then we might not be able to force match the segment. In these cases, the RaceShape tool Chuck mentioned may be really useful. With that tool you can snap parts of your activity to the roads. http://strava-tools.raceshape.com/snap/. If you can pin-point where in your activity the drift caused you to miss matching a segment, you can try to snap that part of your activity to the road. You have to export the data from RaceShape and reupload the data to Strava, but its a great tool. Always a good idea to export your data to GPX from Strava to save the original file before you delete and reupload the RaceShape version.
3. I also think Peter's instructions on how to reset your phone's locations services is really helpful. I'm glad this is coming right from Apple, and if it works, it could really improve some of the bad GPS problems mentioned in this forum.
Keep the feedback coming!
-Elle, Strava Support
on some rides I lose gps signal and the ride is not recorded
Thanks Elle and Peter, this was really helpful!
Not even that Race Shape site can sort out the end of this ride: -
Looks like a toddler has scribbled on the map.... also a top speed of 75.6mph, looks like I'm gonna enter the olympics and wipe the floor with everyone with speeds like that!?!?!?
Surely the GPS can't be that inacurate??
A small point that I learned recently is that Apple use assisted GPS - this means that it needs cell phone data to get a fix and then refine it with GPS. I turned airplane mode on for a long ride thinking this would save battery life - the GPS appears to work just fine in airplane mode but the ride wasn't picked up correctly on wahoo / strava, it was 20km shorter and missed whole sections of the ride. You need the phone on to map the GPS.
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