How should contact be established with an En Route Flight Advisory Service (EFAS) station?

Establishing contact with an En Route Flight Advisory Service (EFAS) station is specifically done by calling Flight Watch on the designated frequency of 122.0 MHz. This frequency is set aside for pilots to obtain weather updates, advisories, and other pertinent information in-flight. Using Flight Watch allows pilots to receive real-time, localized weather information that can be critical during navigation and flight planning.

In contrast, 121.5 MHz is a distress frequency and is not intended for making regular contact with advisory services. While 120.0 MHz may be used for general inquiries, it is not the correct channel specifically designated for EFAS. The frequency 123.45 MHz is often used for air-to-air communications and may not be monitored by EFAS, making it unsuitable for this purpose. Therefore, Flight Watch on 122.0 is the correct choice for establishing contact with an EFAS station.