Just finished a large "before and after" type of photogrammetry project. We used the GO APP on iOS (iPad Air 2) to record and later fly waypoints over a grid (about 400 meters x 400 meters) of ground targets spaced 10 meters apart that were placed per GPS coordinates.
For the "before" analysis, we had to fly the pattern first (in F mode), up one row about 400 meters, then back down the next row over, back to the starting point. This resulted in 4 waypoints; one at the beginning of the row, another at the end, then jogging over to the next row for another waypoint, and finally back to us at the end of the row for the last one. Pretty basic.
Then, we saved the mission as a favorite. We'd put a new battery in, take off, switch to F, bring up the saved mission, start it, adjust the speed down to about 1.2 m/s and the slave controller guy operated the camera.
For the "after" process, all we had to do was bring up each of the favorite missions in swquence in F mode and go. We didn't have to change batteries as often because we didn't have to fly each mission twice, so it worked perfectly and we got great data in less time than anticipated.