We're proud of being the designer of data transfer program on mobile phones with more than 20 years of experience and hard work in projects dams:(Khoda afaring ,Siyah bishe ,Gotvand ,Dariyan) ,the subway system and etc. Facing problems of surveying, I’ve been trying to design applictions, android, VB, lisp and all programs which are in our telegram channel @naghshebardaraneparseh.
You can put file.dxf that has 3dface to your mobile then write coordinate and calculate high also you can export file.dxf and see point position on map.
DTM cut fill surveying can receive line, point, Arc, 3dface from file.dxf There are one sample from dam .when you use this app then you don’t need map and expensive total station and you can calculate how much is cut or fill.

You can read help menu and use app. When you transfer data to your mobile then you can use other apps to control the tunnel ,cut and fill ,draw plan , Topography , section , 3d picture in autocad , Travese , ..
You can see other apps also you can join to my channel and send serial for receiving password. I say that we don’t need expensive total station because apps can help us.