#Gps

2 posts tagged Gps

Waze not getting a GPS fix

· Errors, Google, Hardware, Software

TL;DR: recalibrate your compass.

I’ve come across an issue for the past 10 days that Waze kept losing its GPS fix. This meant:

  • constantly switching between 0 and 120 (or whatever) km/h
  • constantly zooming in & out on maps (dynamic zoom level depending on speed)
  • being in a field/not on the road for most of the time, or stuck to a location of many minutes ago
  • often & randomly losing GPS fix (ie middle of the highway without any buildings blocking the line of sight)
  • I could do a 45 minute trip with Waze never getting a GPS fix
  • not knowing road issues (accidents, traffic jams ahead, speed traps, etc)
Things I tried:
  • nothing changed (no new car window, didn't move my phone location in the car, etc)
  • not moving (ie parked car) didn't really improve the GPS fix
  • even left my phone with Waze on in the car for 30 minutes parked (got a fix, but later that evening when driving home it started to lose its GPS fix again)
  • clear Waze cache
  • uninstall Waze completely
  • GPS Essentials showed a fix with 3 or more GPS satellites when Waze couldn't get a fix
  • I was about to find a way to reset my GPS and/or clear its cache (???)
PS: I have had this issue in the past (I believe with the same phone, a Nexus 5), but it went away after several days.

What I did notice, however, is that in Google Maps the arrow (clicking the pin point button twice or something) was pretty much showing the opposite direction of how the car was moving (thus driving backwards at ~120km/h). This made me think, as I know the GPSes in smartphones are quite cheap and aren’t always on (to save battery – my phone is always being charged in the car though) and the phone uses the accelerometer and other sensors to “guess” current path (or rather, path changes, ie taking a turn or slowing down/accelerating).

Les Menuires - GPS tracking

· Travel

The weekly record (on day 2 – after that I kind of busted my knee, I got tired, and snow was less optimal ;) )

105 km distance skied (including lifts) with a top speed of just below 80km/h.

Screen Shot 2014-03-20 at 19.35.32

Tracked using WRDSystems GPS tracker prototype.

My record last year (using Google Tracks) was 83km/h.

Screen Shot 2014-03-20 at 19.39.13 Screen Shot 2014-03-20 at 19.41.59 Screen Shot 2014-03-20 at 19.45.52