The TCN684 TACAN is a wideband navigation aid system which provides range and bearing information. It is compatible with all existing Airborne TACAN interrogators. The system is designed and manufactured to meet the requirements laid down in MIL-STD-291C, FAA-E-2828a, ICAO Annex 10 and MIL-STD-810F for this type of equipment. In addition, all devices, material and tests are in accordance with above standards.