We have been using KlauPPK systems since September 2018 to measure change in 125 acres of saltwater shoreline properties which are eroding from increasing storm energy and rising high tides. For this 6+ year project, we did not have the option of distributing ground control targets across tidal flats, sandbars, beaches and seawalls. We have had superb results from the Phantom 4 Pro KlauPPK system.