This tool will help directional drillers and company men with day to day calculations for standard directional drilling and a segmented (survey) tool for curves!
Terms of use : https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
What's new (v2.1.1)
Added a UI update for BRN/DLN to update when changed in the survey setup and also added a button to change target TVD from the survey screen.