Pilots say it is also very important that whatever you use to make your symbol, it should contrast as sharply as possible with the background. There are almost as many different codes as there are agencies using codes. Ten-1 Cannot understand your message. Your Signal is good. Cancel last message.
Station is busy.
Arrived at scene. Out of service. Repeat last message. Ten-27 Request for information on license. Ten-28 Request for vehicle registration information.