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Police code. A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include "10 codes" (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes, or ...
United States[edit] In the United States, response codes are used to describe a mode of response for an emergency unit responding to a call. They generally vary but often have three basic tiers: Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with emergency lights, but without sirens.
Ten-code. Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code. [1]
Radar targets within approximately 3 nautical miles (3.5 mi; 5.6 km) of each other. Guns An air-to-air or air-to-surface gunshot. H Hard (direction) High-G, energy-sustaining turn. Head/head on (USAF) Target with an aspect of 160 to 180 degrees. (Naval) Target with an aspect of 0 to 20 degrees. Heads up Alert of an activity of interest. Heavy
The normal climb values used for determining MCAs in the United States are: 150 feet per nautical mile from mean sea level (MSL) to 5000 feet MSL; 120 feet per nautical mile from 5000 feet to 10,000 feet MSL; and 100 feet per nautical mile at 10,000 feet MSL or above. Illustration showing how MCA is determined.
Amateur radio users in the U.S. and Canada have used the R-S-T system since 1934. This system was developed by amateur radio operator Arthur W. Braaten, W2BSR. It reports the readability on a scale of 1 to 5, the signal strength on a scale of 1 to 9, and the tone of the Morse code continuous wave signal on a scale of 1 to 9.
An MGRS grid reference is a point reference system. When the term 'grid square' is used, it can refer to a square with a side length of 10 km (6 mi), 1 km, 100 m (328 ft), 10 m or 1 m, depending on the precision of the coordinates provided. (In some cases, squares adjacent to a Grid Zone Junction (GZJ) are clipped, so polygon is a better ...
Standard frequency and time signal-satellite service (short: SFTSS) is, according to Article 1.54 of the International Telecommunication Union's (ITU) Radio Regulations (RR), [2] defined as A radiocommunication service using space stations on earth satellites for the same purposes as those of the standard frequency and time signal service .