If too long didn't watch: it's a GPS equipped beacon/locator DIY system based on popular radio development boards compatible with Arduino: LoRa32u4 and ESP32 LORA32 working in 868/915MHz band using LoRa modulation. You put a beacon on anything you want to track: airplane, drone, car, boat, wife, husband and use Locator to get distance and heading. Both beacon and locator are battery operated and should have a range of a few kilometers in the air.