What is the meaning of observer-target line?

(DoD, NATO) An imaginary straight line from the observer/spotter to the target. See also spotting line.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). observer-target line. Retrieved September 20, 2026, from http://smartdefine.org/observer-target_line/definitions/1963106
ChicagoMilitary Dictionary (DoD). 2011. "observer-target line" http://smartdefine.org/observer-target_line/definitions/1963106 (accessed September 20, 2026).
HarvardMilitary Dictionary (DoD) 2011, observer-target line, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/observer-target_line/definitions/1963106>.
MLAMilitary Dictionary (DoD). "observer-target line" 4 April 2011. Web. 20 September 2026. <http://smartdefine.org/observer-target_line/definitions/1963106>