This is a free app to calculate the directional parameters between two stations using the five commonly used surveys methods.

This app uses the formulas to calculate the survey parameters (diff of TVD, N/S, E/W, DLS) between two stations of the methods:

1. Tangential
2. Balanced Tangential
3. Minimum Curvature
4. Radius of Curvature
5. Average Angle

Also available the formulas of the methods.

This app was developed based in existing spreadsheets. There is no comparison with any other software.

You can contribute with suggestions for improvements, correcting the translation to english, reporting bugs and spreading it to your friends.

Our portfolio for Directional Drilling available on the App Store:

- "Directional Drilling" a complete app (building and plotting) with well planning, survey, multi-lateral, etc.

- "3D Interpolation" to calculate a survey data between two stations.


These tools & materials are provided 'as is' without warranties of any kind, express or implied.

Please verify the tools provided by this application by yourself before you use them. Ensure you understand the impact of using these tools.

Any use you choose to make of these tools & materials is undertaken by you entirely at you own risk.


What’s New

Version 2.0

- Compatibility with newer iPhone and iPad models.
- Compatibility with newer iOS and iPadOS.
- Compatibilidade with Dark Mode.

App Privacy

The developer, Carlos Moura, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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