At airports, the marshaller signals the pilot to keep turning, slow down, stop, and shut down engines, leading the aircraft to its parking stand or to the runway.
Sometimes, the marshaller indicates directions to the pilot by driving a "Follow-Me" car (usually a yellow van or pick-up truck with a checkerboard pattern) prior to disembarking and resuming signalling, though this is not an industry standard.
At busier and better equipped airports, marshallers are replaced on some stands with a Visual Docking Guidance System (VDGS), of which there are many types.On aircraft carriers or helipads, marshallers give take-off and landing clearances to aircraft and helicopters, where the very limited space and time between take-offs and landings makes radio communications a difficult alternative.
It also prescribes "earplugs, muff-type ear defenders, or headsets in the immediate area of aircraft that have engines, Auxiliary Power Unit, or Gas Turbine Compressor running.
[2] In the United States noise limits at work are set by the Occupational Safety and Health Administration (OSHA).