US Delivery Only. Has the capability to track up to four ground stations simultaneously in range and two in bearing. Tracking velocity is up to 1800 knots. TACAN+ employs software controlled antenna switching, allowing the aircraft to be configured for dual antennas if needed.The system can be used for Air-to-Air and Air-to-Ground operations and meets MIL-STD 291C and NATO STANAG-5034. Designed with rugged military environments in mind, the system has been tested to MIL-STD-810G, MIL-STD-704 and MIL-461E as well as meeting DO-160F helicopter vibration levels. The TACAN+ system features lightning protected circuitry and is subjected to Highly Accelerated Stress Screening (HASS) and Highly Accelerated Life Testing (HALT) to achieve maximum system reliability.