Im a professional engineer and a land surveyor. Im now using this app in the field and office for making "house footprint" field notes. I am loving it. My only suggestion: the ability to turn on an "orthometric" mode, where we can hold right angles either to the "left" or to the "right." We can set the grid, and "snap to the grid," but that can get tricky with scale changes. Overall I am pleased, and will continue to use this app and support the development.