S: (n) monitoring (the act of observing something (and sometimes keeping a record of it)) "the monitoring of enemy communications plays an important role in war times"
S: (n) sighting (the act of observing) "several sightings of enemy troops were reported"
S: (n) look, looking, looking at (the act of directing the eyes toward something and perceiving it visually) "he went out to have a look"; "his look was fixed on her eyes"; "he gave it a good looking at"; "his camera does his looking for him"
S: (n) view, survey, sight (the act of looking or seeing or observing) "he tried to get a better view of it"; "his survey of the battlefield was limited"