What is indicated by the code 10-64?

The code 10-64 is commonly understood to mean "Message for delivery." This is a specific code used in communications, particularly in law enforcement and emergency services, to indicate that a message is ready to be sent or delivered to the intended recipient.

In the context of dispatch practices, when operators or dispatchers receive a code like 10-64, they understand that they should be prepared to relay information or ensure that the message reaches its destination. This allows for clear and concise communication in high-pressure situations where clarity is essential.

The other options, while related to communication protocols, do not align with the specific meaning of 10-64. For instance, "Reply to message" refers to acknowledging or responding to previous communications, which is different from notifying about a new message for delivery. Similarly, "Return to" typically signifies that a unit is being instructed to go back to a previous location, and "Prepare to copy" indicates that a unit should get ready to write down information being communicated, neither of which directly matches the intent of code 10-64.