Real-time Kinematic (RTK) positioning provides centimeter-level positioning accuracy within several seconds. but it has to rely on a nearby base station. Although Precise Point Positioning (PPP) supplies precise positions with one receiver. its convergence time takes several tens of minutes. https://www.duospiritalis.com/limited-deal-Radio-Birdman-Rock-Roll-Soldiers-T-Shirt-super-grab/