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The two most common types of radionavigation systems are GPS and Loran-C. GPS stands for Global Positioning System and is a satellite-based navigation system that uses signals from satellites to calculate the position of a receiver on Earth. Loran-C is an older system that uses radio signals from multiple transmitters to determine the location of a receiver on Earth. Both systems can be used to provide navigation guidance and can be used in combination with other navigational aids, such as maps and compasses.