One example embodiment relates to a navigation system for a guided projectile. The navigation system includes a detector within the guided projectile. The detector determines an actual amount of time it takes after launch for the guided projectile to accelerate through mach one. The navigation system further includes a guidance system within the object. The guidance system includes a projected flight plan for the guided projectile. The projected flight plan includes an estimated amount of time after launch it will take the object to accelerate through the speed of sound. The guidance system compares the actual amount of time and the estimated amount of time and adjusts the flight path of the guided projectile based on data received from the detector.