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Marshall Falconry GPS system. - YouTube
Field Marshall Digital Tracking Receiver VHF – Marshall Radio United Kingdom
RT - PLUS TAIL MOUNT TRANSMITTER 216, 218Mhz - Mike's Falconry Supplies
Marshall Radio Telemetry - At 9 grams with battery, the RT-GPS is being safely used on smaller birds, such as this clean little Aplomado falcon weighing only 240 grams. Photo by Vahe