Victor Tasiemski is a systems engineer and U.S. Air Force space systems veteran with Overlook Systems Technologies, Inc. He regularly consults on positioning, navigation, and timing issues. Overlook Systems Technologies, Inc. has supported the U.S. Department of Defense and other Federal Government customers for almost 40 years by providing engineering and technical expertise for Positioning, Navigation, and Timing (PNT) systems. This experience spans GPS modernization, resilient PNT architectures, and the evaluation of complementary and alternative PNT technologies designed to improve the resilience of critical communication and transportation infrastructure.