What is the meaning of HRS?

(Military) HRS stands for horizon reference system
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). hrs. Retrieved September 21, 2026, from http://smartdefine.org/hrs/definitions/1956102
ChicagoMilitary Dictionary (DoD). 2011. "hrs" http://smartdefine.org/hrs/definitions/1956102 (accessed September 21, 2026).
HarvardMilitary Dictionary (DoD) 2011, hrs, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/hrs/definitions/1956102>.
MLAMilitary Dictionary (DoD). "hrs" 4 April 2011. Web. 21 September 2026. <http://smartdefine.org/hrs/definitions/1956102>