We're proud of being the designer of tunnel program on mobile 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.
When surveyor use reference line or arc and receive line,offset,high
He or she can input them in tunnel app and calculate whatever needs for controlling tunnel.
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.