The CAST-3000 fully supports integration testing of GPS/INS navigation systems where the inertial sensor and GPS receiver are either tightly or ultra-tightly coupled. The system produces GPS RF signals coincident with simulated IMU sensor data that provide dynamic testing in the laboratory environment for military and government applications.

Its GPS and INS signals are precisely coordinated and dynamically stimulate the navigation system so the avionics suite may be 'flown' in the lab. The CAST-3000 system algorithms contain mature avionic sensor simulations to provide dynamic vertical channel aiding for maintaining Kalman filter stability via 1553 or 1394.

CAST, Honeywell and Northrop Grumman (formerly Litton) jointly designed and developed proprietary test interfaces for the CAST-3000 to support Honeywell and Northrop EGIs (Embedded GPS Inertial) and IMUs.