Once you open the app you'll see the map interface with buttons on the right-hand corner for measurements and cross sections.

Let's go through the buttons from top to bottom:

1. ARROW - When this button is selected you can normally interact and move on the map

2. MEASURE -  When this button is selected, you can perform direct measurements from point A to point B on the map by pressing the points

3. AREA MEASUREMENT - When this button is selected you can perform 2-dimensional area measurements on the map by pressing the points

4. VOLUME MEASUREMENTS - When this button is selected you can perform 3-dimensional volume calculations on the map against selected DEM models by pressing points on the map

5. CROSS SECTION - When this button is selected you'll enter the cross-section tool where you can navigate between stations and perform measurements based on the data selected on the map

6. FREE CROSS SECTION - When this button is selected you can freely select a spot where to see the cross-section view

TIP: You can Snap measurements to models, 100gons and modify them - These buttons will show once you select the tool