Methods, systems, and apparatus include computer programs encoded on a computer-readable storage medium, including a method for providing information. The method includes receiving a prompt from a user operator associated with a first unit. The method further includes determining a location associated with the first unit. The method further includes responsive to the prompt, determining one or more second mobile units within a geographic area associated with the location. The method further includes outputting a communication to the one or more second mobile units. The method further includes enabling a direct communication link between the user operator and an operator associated with a respective one of the one or more second mobile units. The method further includes providing environment information to the one or more second mobile units based at least in part on the prompt.