Avionics 1. Navigation and Guidance - GPS satellites are to be used from above in the future a. Navigational gyros and inertial guidance systems are used to sense attitude and velocity b. Accelerometers. 2. Batteries to power system. 3. Instrumentation - . 4. Onboard Computer - closed loop control feedback control systems - flight computer used for telemetry and control of 1st stage booster as well as: a. controls thrust b. controls tank pressurization c. navigational information d. fires engines e. data acquisition - collect data during flight. Preflight: direct control of the engine and vehicle. During flight: engine parameters are measured and sent back through telemetry.