NextNav, Inc. is the developer of a 3D geolocation service known as Metropolitan Beacon System, a wide-area location and timing technology designed to provide services in areas where GPS or other satellite location signals cannot be reliably received. MBS consumes significantly less power than GPS and includes high-precision altitude. In the United States, NextNav operates its MBS network over its spectrum licenses in the 920-928 MHz band. The company went public on Nasdaq in October 2021 with a merger with special-purpose acquisition company Spartacus Acquisition Corporation. Wikipedia