What conditions determine whether a particular network has a checkmark on its left after a scan is complete. I realize that the checked networks are represented in the coverage heat map but I saw that three (two of mine and one of a neighbor) were checked out of 20 detected at one location. Is it the top three by S/N ration?
By default, NetSpot selects _available_ networks, so those that either have security set to None, or those your MacBook can connect to at the time of scanning (saved password, etc).