Glossary
English
167
Tactical/
Non-Revert
The user talks on the channel that was 
selected before the radio entered the 
emergency state.
Talkaround
Bypass a repeater and talk directly to 
another unit for easy local unit-to-unit 
communications.
Talkgroup
An organization or group of radio users 
who communicate with each other using 
the same communication path.
TMS Text Messaging Service
Trunking
The automatic sharing of communications 
paths between a large number of users 
(see Conventional).
Trunking 
Priority Monitor 
Scan List
A scan list that includes talkgroups that are 
all from the same trunking system.
USK Unique Shadow Key.
Term Definition
UTC
Coordinated Universal Time. The 
international time standard (formerly 
Greenwich Mean Time, or GMT). Zero 
hours UTC is midnight in Greenwich, 
England, which is located at 0 degrees 
longitude. Everything east of Greenwich 
(up to 180 degrees) is later in time; 
everything west is earlier. There are 42 
time authorities around the world that are 
constantly synchronizing with each other. 
Abbreviated as UTC (English backronym = 
Universal Time, Coordinated), it is also 
known as Zulu (Z) Time.
Zone A grouping of channels.
Term Definition