The potential commercial use of the developed technologies is extensive. Examples of key application areas that could benefit through use of the developed technologies include: underwater vehicle navigation, Tx/Rx Antenna steering, UAV Auto Pilot, the guidance/control of precise munitions, and numerous unmanned missions involving operations in subterranean, remote, unknown and hostile enclosed environments such as natural cave networks, underground and underwater tunnel networks, building floors, and spaces within a collapsed building rubble field. The successful completion of the proposed work will lead to improvements in the safe operations of commercial and general aviation (GA) aircraft and address the goals of the NASA Space Communication and Navigation Office. The proposed technologies with an emphasis on real-time attitude estimation through the use of a coupled accelerometer array and GPS unit will be directly applicable to Reusable Launch Vehicles, low cost attitude determination on low dynamics sub-orbital carriers, inertial measurement estimation in non-GPS friendly environments and space-based range applications. It will lead to benefits in the form of improved reliability, accuracy, and sustainability of safety-critical aerospace systems.