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Ten-codes are abbreviated phrases used by public safety officials and CB radio enthusiasts to communicate quickly and clearly. Learn about the history, meaning and usage of ten-codes, such as 10-4 (understood), 10-33 (officer needs help) and 10-7 (out of service).
Learn how different countries and agencies use predefined systems to describe the priority and response assigned to calls for service. Compare the codes and methods used by emergency services in the United States, the United Kingdom, and other jurisdictions.
Learn about the techniques and standards used to communicate over two-way radios in various applications and domains. Find out how to use voice, speech, microphone, and brevity codes, and how to comply with international and national regulations.
The web page describes the communication failures and successes of various parties involved in the 2001 terrorist attacks and their aftermath. It mentions the radio tower problem as one of the factors that affected the response of the federal government, first responders, and victims.
The FDNY is the full-service fire department of New York City, serving all five boroughs. It is organized into five borough commands, nine divisions, and various units for fire suppression, EMS, rescue, and prevention.
Learn about the history and usage of the International Code of Signals, a system of flags and codes for maritime communication. The code includes a standardized alphabet and numerals, as well as messages for safety of navigation and related matters.
Learn about police codes, numerical or alphanumerical abbreviations used by law enforcement over radio systems in the U.S. See examples of 10 codes, signals, incident codes, and other types of codes, and how they vary by state, county, and agency.
Learn about the history and usage of the APCO phonetic alphabet, a competing spelling alphabet to the ICAO radiotelephony alphabet, used by many U.S. law enforcement agencies. Compare the APCO alphabet with other variations and see examples of code words for each letter.