What is a GMRS Repeater?

What is a GMRS repeater, and what does it do? Wikipedia tells us a radio repeater is a combination of a radio receiver and a radio transmitter that receives a signal and retransmits it, so that two-way radio signals can cover longer distances. A repeater sited at a high elevation can allow two mobile stations, otherwise out of line-of-sight propagation range of each other, to communicate. [1] Repeaters are found in professional, commercial, and government mobile radio systems and also in amateur radio . The 462.625 and 462.675 GMRS repeaters sit on High Potosi at 8050'. It's those snow-covered mountains we see Northwest of Dolan Springs. The repeaters are about 80 miles away yet you can hit both repeaters with a handheld radio. These repeaters extend the range of a $35 handheld radio from one mile or so to over 100 miles, with the 462.625 repeater covering from Dolan Springs to Santa Clara Utah. How...