During a radio check, what does a readability of '5' signify?

A readability of '5' signifies a perfectly clear message. The readability scale in radiocommunication ranges from 1 to 5, where '1' indicates that the message is not readable at all, and '5' indicates that the message is transmitted without any interference, distortion, or background noise, ensuring that the communication is crystal clear. This level of clarity is vital in maritime communications, where clear and accurate information can be critical for safety and operational efficiency.

The concept of readability is essential for assessing the quality of voice communications over radio, and a rating of '5' confirms that both the sender and receiver can hear each other perfectly, enabling effective communication.