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542 posts

Ultimate Geek
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Topic # 179318 3-Sep-2015 20:31
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So I've spent the past two days having a bit of a read about this. My problem stems from S4 suddenly becoming a little flaky recording in My Tracks and Strava.
I'm not out to be KOM but it's nice to have a target etc. Three times my S4 has flat out not recorded the ride, it's got a GPS lock before I set off (as I check) then recorded for 90 minutes saying I've moved 41m. So I guess there are a few questions. Firstly the phone had worked pretty well until just before Lollipop last month, it would occasionally get some drift and position me too close to a Strava segment. I'll be riding an uphill section to reach a downhill segment, and the gps drift means it thinks I've started the DH as I've got too close to the waypoint (which is usually some distance away to avoid this problem).
So, does the case make a difference, does having the phone in my shorts pocket versus having it in my Camelbak (the phone pocket is up highest on the outside of the pack).
A friend has offered me his old Garmin 310XT which he wears as a watch for Triathlon but has a handlebar mount for it. I imagine it's possibly more accurate but will require a bit more faffing to upload the data (hence the appeal of using my phone).
So are there things I can do to improve the phone? It's 2 years old and been pretty bulletproof other than this.
I'm open to a dedicated device and don't need navigation as such as I'm riding familiar tracks, I just want the data logging for servicing intervals and Stravassholing!

NB I did play with the GPS settings in MyTracks, and messed them up entirely. I don't think there is access through Strava to the phone's gps settings, or in the actual phone software itself?

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1923 posts

Uber Geek
+1 received by user: 139

  Reply # 1379416 3-Sep-2015 21:40
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GPS signals are very weak and if you want to get the best performance from your device then you should put whatever you use either in the top pocket of your camel back or on your handlebars.

A firmware update to your device may have affected the ability of its GPS to capture and resolve these weak signals and/or increased interference from other radio sources within the device.

With regards to accuracy/drift, any comsumer grade GPS is only accurate to (approximately) the average width of a road. Many mapping apps use software to average positions, and techniques like snapping your position to the correct side of the road for your direction of travel, all to minimize apparent errors.

Mad Scientist
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  Reply # 1379436 3-Sep-2015 22:44
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I have only ever had 2 androids. S2, S4. Both devices the GPS is very very bad compared to iPhone 4, 5S, other people's Samsungs, Who are just as great as my iPhone.

My two theories.
2 very coincidental bad gps on different Samsungs
My body emits some electromagnetic interference
(Actually i just remember, i flashed all sorts of junk roms on them, but...)


1390 posts

Uber Geek
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  Reply # 1394832 26-Sep-2015 14:32
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Sorry to be so late to the party, I don't frequent the GPS forum! Your phone sounds like it's having the same GPS issue that my Galaxy Note 2 has had twice now. It mucks up it's position for any Google products. My maps position would be way out, etc. Etc. The only solution is to factory reset and set up again. GPS all good again. Mine has done it twice. I'm now on a custom ROM and it's (touchwood) working fine.

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