I have compared this with my little Garmin eTrex, downloading the files to Google Earth and Arcview (the Arcview takes a little manipulation in both cases). When there is no cell-phone signal to the iPad, this app still matches the aerial photos better than the Garmin. When there is a cell phone signal, it matches much better. I have not checked elevations. This app is easy to use and it is easy to export the data. Happy camper.
Update 2018: Now I feed a better-quality GPS fix to the iToy from a Bad Elf Pro +. It is really easy to generate sample points in GIS, push the to the app from DropBox, and navigate to them in the field. And even easier to record waypoints in the field then send them back to GIS.
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