iPhone app

   I tried Nikon's GPS attachment, but it only geotagged about a third of the pictures in any given shoot, so I gave up on it. Recently thereafter, I found gps4cam, which is a really nifty little app that records your location at fixed intervals (I use 1-minute intervals for better accuracy). At the end of a shoot, you photograph a QR code the app generates on your phone. The desktop version (Mac & Windows) then synchronizes your camera's clock to your phone's clock and interpolates where you were at the moment each photo was taken. I've found it to be quite accurate.

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