+setuid root, so that it can create an ICMP socket. Root privileges
+are disavowed shortly after startup (just after connecting to the
+X server and reading the resource database) so this is \fIbelieved\fP
+to be a safe thing to do, but it is usually recommended that you
+have as few setuid programs around as possible, on general principles.
+.EX
+chown root.root sonar
+chmod u+s sonar
+.EE