Nex7 and GPS

Hey,

Using iphone for GPS4Cam will be eaten your iphone battery power and ended up with empty power to use your phone I think. I use my iPhone for DoF calculation or Sunrise/set info only. If you are walking around to take photos for the whole day, you shouldn't use your iphone for GPS. In stead, using separate device is better for iphone and better for your location data.
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Best Regards,