I have multiple 3D, how can I select multiple 3D from the velocity – volume fly – out to generate the velocity volume?

If you open the Volume fly-out and click in the surveys box and then press the little icon, if you get a pop up with no surveys, the survey geometries are missing. You can easily fix this:

1. Save the mode (just in case!)
2. Use “File > Open TK… > Merge Mode”
3. Toggle off everything except the 3d Surveys box
4. Step through pressing next until you get to the Surveys import page
5. Drag each 3d survey you need from the left tree to the middle tree
6. Press Next, Next then Finish

The surveys should then be listed in the Velocity > Volume > Survey box; you select a survey, generate the volume, then select the next survey etc.