I did an experiment a year or so ago where I compared the error in a Gamin handheld GPS unit to my Samsung Galaxy Nexus smart phone. I discovered that the Garmin is roughly twice as accurate (or more specifically has half the error) of the smart phone.
http://blog.oplopanax.ca/2012/11/mea...-gps-accuracy/

I've always been interested in comparing the performance of these devices, and under different circumstances. So I developed a web site to allow members of the community to upload their own GPS tracks, and analyse and compare the error in the device.


What you do:
* record a track while your GPS is stationary
* upload the track and some details of the experiment to the web site
* I will plot the distribution of the error and calculate the 50% and 95% confidence intervals.


http://gpserror.azurewebsites.net/

I would be interested in hearing from people on how this could be improved. If there is no interest. I'll eventually take it down.

Current plans for improvement
* comparison of error plots at same scale
* live gathering of data from a device

Help requested;
* I need a good data gathering system for iPad and iPhone that I can recommend to users.
* for Samsung and Andoid I used the MyTracks app, if anyone has a better suggestion I would love to hear it.