-This program draws a simulation of a sonar screen. By default,
-it displays a random assortment of ``bogies'' on the screen, but if
-installed as "setuid root", it can ping (pun intended) your local
-network, and actually plot the proximity of the other hosts on your
-network to you. Written by Stephen Martin and Jamie Zawinski.
+This program draws a sonar screen that pings (get it?) the hosts on
+your local network, and plots their distance (response time) from you.
+The three rings represent ping times of approximately 2.5, 70 and 2,000
+milliseconds respectively.