Topography On the Fly is a suite of land surveying tools. It allows you to have complex surveying calculations on the field quickly with maximum accuracy. The design is as simple as needed under work pressure. The advantage is that can be used only with a simple total station or additionally with more complex instruments and gps.

Angular units : gradians (default) and decimal degrees (degrees only in Distance/Azimuth).

Task list:
Direct geodetic problem
Inverse geodetic problem
Simple forward intersection
Two points resection – Free station
Simple resection
Inaccessible points
Line-line intersection
Line-circle intersection
Azimuths intersection
Tacheometry
Circles overlap
Trigonometric leveling

Great tool for land surveyors, civil engineers, topographers and land engineers.

Download also our free application:

"Geodetic NET" from Google play
https://play.google.com/store/apps/details?id=com.GeodeticNET&hl=en

"Surveying In the Field" from Google play
https://play.google.com/store/apps/details?id=com.Surveying.IntheField&hl=en

"Topographia Classic" from Google play
https://play.google.com/store/apps/details?id=com.Topographia.Classic&hl=en&gl=US

Don't forget to rate this app and send us a feedback.

// Option A //

To download Topography On the Fly mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Topography On the Fly mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Topography On the Fly from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Topography On the Fly in HappyMod App.