GPS4CAM

Great app the precise is very accurate. Cheap and not camera specific.

You do need a clean shot of the bar code with a plain unclutterd background.

I have this app both on my iPad and iPhone. The QR code is easily photographed from the iPad.

I also save the trip maps as a log of travels.

lfmerrell about gps4cam - Geotag Your Photos, v7.8.2