Brevity code used via APRS to request communications elsewhere
APRS Calling is a manual procedure for calling stations on the Automatic Packet Reporting System (APRS) to initiate communications on another frequency, or possibly by other means. It is inspired by Digital Selective Calling, a part of the Global Maritime Distress Safety System.[1][2] It also builds on existing digital procedures inherited from morse code and radioteletype operation.[3] ITU Q codes are used in conjunction with APRS text messages to implement APRS calling. APRS calling is intended to complement monitoring voice calling frequencies.
^Brehaut, Denise. GMDSS A User's Handbook. Bloomsbury Publishing Plc, 2009, p. 35.
^Bass, Richard K. GMDSS A study guide for the Global Maritime Distress Safety System. Tele-Technology, 2007, p. 9-1.
^Combined Communication Electronics Board (CCEB). Communications Instructions ACP 131 (F) Operating Signals. Combined Communications-Electronics Board, 2006, p. 2-25.
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