Global Positioning System (GPS) signal jamming has become a prevalent threat to the safety of all aircraft. The proposed solution provides accurate and reliable position, navigation, and timing (PNT) during GPS L1/L2 jamming utilizing existing equipment already present on aircraft. Thus, the solution avoids mounting new hardware onto aircraft, therefore avoiding costly new equipment, lengthy approvals, and labor hours. The objective of this program is to reduce transition risk by build a prototype, evaluate it with extensive flight tests, and deliver the prototype to the end-customer for evaluation.