A direct-broadcast remote identification (RID) device attachable to an unmanned aircraft system (UAS) encodes identifier signals based on a unique identifier of the UAS and position data, e.g., the current and originating (launch) positions of the UAS, and transmits encoded data signals receivable and decodable by specially configured receiver devices in range. The encoded identifier signals may be transmitted at low power via radio-control frequencies, whitespace frequencies, ISM frequencies, DME frequencies, or ADS-B frequencies as needed. The receiver devices may decode identifier signals to display the relative positions of, and information about, nearby UAS even in internet-denied areas (standalone mode). The receiver devices may retrieve additional data, such as operator information and flight plans, from remote databases by establishing wireless connections when said connections are available (connected mode).