diff --git a/lib/argus/nav_monitor.rb b/lib/argus/nav_monitor.rb
index <HASH>..<HASH> 100644
--- a/lib/argus/nav_monitor.rb
+++ b/lib/argus/nav_monitor.rb
@@ -65,6 +65,9 @@ module Argus
       if @nav_data.bootstrap?
         @controller.demo_mode
       end
+      if @nav_data.control_command_ack?
+        @controller.ack_control_mode
+      end
       data.options.each do |opt|
         @nav_options[opt.tag] = opt if opt.tag < 100
       end
Add ack_control_mode command to NavMonitor

This was done to see if it improves the nav data stream. We still
reached a point where the nav data had stopped, so I don't think we
are there yet.  Perhaps we need better logging capability to monitor
program state along with the nav data.