Military communities have long recognized the value of using flight simulations for enhancement of mission performance. Although flight simulators depicting virtual images of mission profiles are known to improve situational awareness, pilots using head-mounted display virtual reality (HMD/VR) environments often report increased signs and symptoms associated with simulator sickness. With shipboard deployment of HMD/VR training devices, disparity between VR visual flight conditions and ship induced vestibular accelerations may generate changes in reflexive head movement, and thereby influence risk of simulator sickness. In this study, nine subjects flew a head- mounted display HMD/VR flight simulation during land based and shipboard conditions. Reflexive head positioning and simulator sickness questionnaires (SSQ) were used to evaluate differences between the two conditions. Results indicate that both land and shipboard HMD/VR flight simulations produced optokinetic cervical reflex (OKCR) responses.


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