by Directional Drilling Survey for iPad
New in this update 2.0:
1. Well Planning with multi sections (to 10 sections);
2. Ability to build a section with build-up/drop-off rate to change inclination and TURN RATE to change azimuth.
3. Ability to customize each section with color, show/hide section in graph, show/hide data in graph and move position, show/hide plan view in 3D and show/hide departure dashed line and Circle Radius;
Screenshots:
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Well Control 
This update V2.0 is buggy. It worked initially on my IPad3, but now when I press the icon, there is nada. Hope you can fix it, and issue a solution, or another upgrade.
It may have been problems during the download. Delete the app and
download it again from the App Store.
No charges for downloads again, such as for updates.
note:
this deletes all your data files. if you have important data files, back up using software such as “iphone explorer.”
I still have not received any complaint of this new version of the directional survey. if you find bugs or have any suggestions for improvement, please let me know.
Thanks
Carlos