What condition is associated with a 3D Differential Navigation capability?

The condition associated with a 3D Differential Navigation capability is that all systems are operational. 3D Differential Navigation utilizes satellite signals and ground reference stations to determine an aircraft's precise location in three-dimensional space. For such a system to function effectively, all necessary components, including satellite systems, ground stations, and the aircraft's onboard equipment, must be working correctly. When all systems are operational, the navigation solution can provide the highest accuracy and integrity required for safe flight operations, thereby enabling precise position reporting and guidance.

Other scenarios, such as being WAAS equipped or facing NOTAMs, may affect navigation capability but do not inherently guarantee the functionality of all systems required for 3D navigation. Likewise, a satellite failure would compromise the navigation capability, making it impossible to achieve 3D Differential Navigation. Hence, the overall operational status of all systems underpins the effectiveness of this advanced navigation capability.