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VFR flight above 12,500' ASL when no other code has been assigned. [7] Japan: VFR flight above 10,000' MSL when no other code has been assigned. [citation needed] US: External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.) [3] 1500 US
[6] [7] Air traffic control (ATC) units use the term "squawk" when they are assigning an aircraft a transponder code, e.g., "Squawk 7421". Squawk thus can be said to mean "select transponder code" or "squawking xxxx" to mean "I have selected transponder code xxxx". [6]
The initial altitude is sometimes stated on the charts. If not, it will be given by the air traffic controller. The departure frequency is given to the pilot when ATC hands the aircraft over to the next sector. A typical IFR clearance would be: OOABC, cleared to Ostend via the DENUT 7C departure, climb flight level six zero, squawk four six ...
IATA codes are published in Appendix A of IATA's annual Standard Schedules Information Manual (SSIM) and are used for airline timetables and computer reservation systems. [2] IATA designators are used to distinguish between aircraft types and variants that have differences from an airline commercial perspective (size, role, interior ...
Provides a 4-digit octal identification code for the aircraft, set in the cockpit but assigned by the air traffic controller. Mode 3/A is often combined with Mode C to provide altitude information as well. [2] C: Provides the aircraft's pressure altitude and is usually combined with Mode 3/A to provide a combination of a 4-digit octal code and ...
[nb 1] The final code variant was developed in late 1961 [5] for the ICAO Communications Division meeting (VII COM) held in January/February 1962, [6] and described in a 1962 FAA report. [7] [8] [9] The exact timeframe and circumstances of the term Gillham code being coined are unclear, but by 1963 the code was already recognized under this name.
The altitude transmitted is pressure altitude, and corrected for altimeter setting at the ATC facility. If no encoder is attached, the transponder may optionally transmit only framing pulses (most modern transponders do). In a mode 3 reply, the information is the same as a mode A reply in that there are 4 digits transmitted between 0 and 7.
The advent of the Internet in the mid-1990s enabled users of modern flight simulators to fly together using multiplayer functionality. In 1997, SquawkBox [25] was created by Jason Grooms as an add-on for Microsoft Flight Simulator 95, enhancing the built-in multiplayer features to allow large numbers of players to connect to the game.