"Reconnaissance (US Army FM 7-92; Chap. 4)
In military operations, reconnaissance or scouting is the exploration outside an area occupied by friendly forces to gain information about ...
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natural features and other activities in the area.
Examples of reconnaissance include patrolling by troops (skirmishers, long-range reconnaissance patrol, U.S. Army Rangers, cavalry scouts, or military intelligence specialists), ships or submarines, manned/unmanned reconnaissance aircraft, satellites, or by setting up covert observation posts. Espionage normally is not reconnaissance, because reconnaissance is a military´s special forces operating ahead of its main forces; spies are non-combatants operating behind enemy lines." - (en.wikipedia.org 29.09.2019)
