You don't need to run a WiFi survey to get a quick overview of the surrounding wireless range. Wait a second or two and the detailed information about existing Wi-Fi networks around you will start appearing in NetSpot.
In previous versions of NetSpot you were supposed to run a tiny "fake" wireless survey on a blank map to scan for wireless networks. Since NetSpot 2.0, this is no longer required as we introduced full-featured Discover Mode. So you get the info about all the networks that are not hidden in a separate list. The list is updated every 5-10-30 seconds. If a network disappears, you can still see it in the list for some time, and find out how long ago it was gone in the Last Seen column.
That's all there is to it! You now have completed your Wi-Fi scan and have a complete list of the available wireless networks in your area. With this information you can choose the Wi-Fi network you wish to connect to or quickly find the one that interferes with yours. NetSpot offers the best WiFi scanning features among all WiFi scanners for Mac and (unlike some others) the Discover Mode is available in the completely free edition of NetSpot.