In EngrApp there are a kind of groups that you can adhere to, they are public groups, and may have special features.
The three icons that you will find in the top right 
have the following functions:
Refreshes the positions in the map
Activates the camera to scan a QR EngrApp code, after the scanning the user is added to the group.
Opens the public groups search engine
This menu shows the five closest groups to the user. If you do not find the group you can search for it in 
and press the magnifying glass.
Add members to the Group.
It might be groups only accesible by scanning the group QR code by search in the search engine or both.
