GPS your photos , found a great tool

Any number of devices will let you create tracking that can be matched to Raw files but not write it to the file's metadata. Some programs will let you create/edit .xmp "sidecar" files that can store changes to metadata. I use Lightroom 4

on my Windows 7 machine to match .gpx tracks downloaded from my Garmin ETrex Vista HCx handheld GPS device. It adds about two or three minutes to my processing time per session. I think workflow in Aperture may be similar.

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Ken Daves