Telemetry & OSD (On Screen Display) solutions for drones, these devices are becoming more sophisticated and important in the drone world. The ability to have vital information from your drone real time as it fly's is critical, the typical information that is down linked from the drone via telemetry and OSD systems are RSSI (Receiver Signal Strength Indication) this will tell you before its to late that your nearing the end of your range. Voltage and current readings from on board the drone battery, again vital info that helps the pilot make informed decisions other more advanced systems may have GPS data, fighter pilot style false horizons and home direction arrows.