RadioMaster ERS-GPS Precision GPS Sensor for compatible ExpressLRS PWM receiversThe ERS GPS Telemetry Sensor is a specialized GPS unit designed by Radiomaster for use with compatible ExpressLRS PWM receivers. This plug and play sensor integrates with the receiver via the CRSF interface. Equipped with two modes Mode one to provide accurate GPS data and Mode two to provide accurate ground speed. Mode one is ideal capturing position and altitude logs when used with our ER series receivers with built in barometers. Mode two is ideal