Explanation: Electromagnetic tracking requires precise magnetic mapping of the flight deck. It is to account for the ferrous and conductive materials in the seat and flight deck to reduce angular errors in the measurement.

Explanation: Thermal is not one of the basic methods used in current HMD technology. There are five basic methods currently being used in HMD technology, they are inertial, optical, electromagnetic, sonic and hybrid.

Explanation: The optical systems employ infrared emitters on the helmet to measure the pilot’s head position. One of the limitations is sensitivity to sunlight or other heat sources.

Explanation: The typical operating frequencies for sonic tracking are in the 50 kHz to 100 kHz range. These can be made to carry audio sound information directly to the pilot’s ears by means of subcarrier modulation.

Explanation: True, the hybrid inertial/optical trackers feature high accuracy. Although, they offer low latency and suffer from precession and drift over time.

Explanation: IHADSS refers to Integrated Helmet and Display Sighting System. The IHADSS is used on the Italian Agusta A129 Mangusta and features Nap-of-the-earth night navigation.

Explanation: Thales introduced the scorpion helmet mounted display system. It was introduced to the military aviation market in 2008 and was the winner of the USAF/ANG/AFRes Helmet Mounted Integrated Targeting program.

Explanation: True, the pilots using scorpion, can view both night vision images and the symbols on the display. The scorpion was designed to be installed on a standard issue HGU-55/P helmet.

Explanation: HObIT refers to Hybrid Optical based Inertial Tracker. It is a tracker made by InterSense and is used on the Thales Visionix Scorpion HMCS and HMIT HMDs.

Explanation: The Honeywell M142 IHADSS comes with a 40° by 30° field of view. It also offers video with symbology monocular display along with IR emitters.