littlebird

Your name isn't Buttle is it?

It no doubt has an EGI - a combined GPS INS. It will depend entirely on the software interpreting that data.

Not sure about network protocols, but, the systems research version of this is called multi-level secure systems. You might want to start looking there.

For a more nuts and bolts view of security requirements and procedures, the NISPOM is publicly available http://www.dss.mil/isp/fac_clear/download_nispom.html

There exist a number of "super users," I believe their role is to minimize redundancy of effort. Even if someone had access to everything, the amount of data generated far exceeds what one person can handle.