In order to protect the GBAS ground segment from unauthorised developments or intrusions that may impact on the performance of the GBAS, a comprehensive protection area should be established around the GBAS site. The area should be designed to protect:

• GNSS satellite reception and tracking at each of the Reference Receivers
• VDB coverage particularly within the Approach Service Volume for each runway.

Depending on the location of the GBAS, restrictions may additionally be imposed on vehicle and/or aircraft movements within the vicinity of the GBAS. These will be site dependent and should be established and verified as part of site deployment.