Clicking CNAV Tools, Logs, Log Viewer or CNAV Tools, Logs, Log Viewer Light allows you to view to the logs generated by CNAV. While both of these tools provide access to system logs, the Log Viewer provides more advanced search capabilities than the Log Viewer Light.
The logs accessible through these tools are those generated by various subsystems of CNAV and are collected and archived by the logger_scour.pl in root's crontab. Therefore, installation of the logger_scour.pl script is required for either of these tools to function correctly.