When I started using a Canon EOS M a year ago I started to miss the GPS capabilities of the PowerShot S100. So this winter I played with a couple of GPS modules and an Arduino Nano until I had a standalone GPS logger that could ride on my autoKAP rig. It also has a barometric pressure sensor (and temperature and humidity) so every few seconds it logs all the data to a microSD card. I flew it for the first time last week and managed to get almost everything to work.
There is a post at Public Lab about the flight
and the video below displays the GPS and temperature data in 3D. I'm still working out the best workflow for getting the GPS data into Google Earth or into the EXIF headers of the photos.
My goto camera rig is now sufficiently heavy and complex that I don't fly it as often as I would otherwise. It also means that a one hour flight leads to six hours of computer work. But I like the storytelling potential it offers, and I hope to be able to use the GPS data to scale and locate 3D terrain models built from the photos (structure from motion). We will see if I ever find time for that.