You can actually install LItchi on the + model controller with the built-in/hard wired screen, though in a bit of a roundabout way, I have used a 3rd party software ($99) called DJIFLightPlanner which does allow you to plan grid missions, then export them as a .csv which Litchi can then run as a waypoint mission--but you're limited to 99 waypoints, so have to be flying a pretty small area. For a better DEM, you'd probably want to plan two grid missions of the same area, perpendicular to each other (and with the outer passes outside your study area)....(Note: the above is also why I bought an additional controller on which I could use a tablet and run Drone Deploy, Pix4D Capture, and MapPilot instead......)