diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -4,6 +4,7 @@
   protect_from_forgery
 
   before_action :current_user
+  before_action :nav_announcement
 
   SINGLE_USER_MODE_CONF_KEY = 'system.single_user_mode'
   MULTIPLE_IP_LOGIN_CONF_KEY = 'right.multiple_ip_login'
@@ -22,6 +23,10 @@
     @current_user ||= User.find(session[:user_id])
   end
 
+  def nav_announcement
+    @nav_announcement = Announcement.where(on_nav_bar: true)
+  end
+
   def admin_authorization
     return false unless check_valid_login
     user = User.includes(:roles).find(session[:user_id])