Works exceptionally well
My buddy and I go on rambling trips through the back country of Tennessee and Alabama looking for old barns and other buildings to take images of. We have found that GeoRagR app is the best geotag app for the IPhone. The offnet GPS feature is worth the cost. As to battery life, yes it will eat up your battery, But e have car chargers that takes care of that. Geotagr is very accurate and the trac is easy to import into Lightroom and apply to your images. Highly recommend
Harley Rea about
GeoTagr