What frequency should be used for South Ground communications?

The frequency used for South Ground communications is 121.70 MHz. This frequency is designated for surface operations at many airports, including YVR (Vancouver International Airport), where it facilitates communication between ground services and the control tower.

Using 121.70 MHz allows ground vehicles to communicate effectively with air traffic control, ensuring safety and coordination while navigating the airside area. This frequency is commonly used for ground movements and plays a critical role in managing the flow of traffic on taxiways and runways.

The other options represent frequencies that may be used for different purposes or in different contexts. Therefore, understanding the specific frequency designated for South Ground communications is essential for compliance with communication protocols and maintaining safety in airside operations.