By international agreement, 2000 is used for aircraft which have not been assigned a transponder code, although in some parts of Europe, 7000 is used for this purpose.
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1000: Mode A transponder code that is reserved for use in Mode S radar/ADS-B setups where aircraft identification is used to correlate flight plan. 2000: Uncontrolled IFR transponder code used when entering a secondary surveillance radar (SSR) area from a non-SSR area.
If you are flying under visual flight rules in uncontrolled U.S. or Canadian airspace, you will use squawk code 1200. You may also hear this referred to as “squawk VFR.” If you're in a controlled airspace, the controller will assign you a unique four-digit squawk code.
Military aircraft operating in restricted/warning areas or on VR routes will squawk 4000 unless another code has been assigned or coordinated with ATC.
The first emergency code that you may have become familiar with is Squawk 7500. This code is used to indicate that the aircraft has been hijacked, and therefore requires urgent emergency support from both security services and air traffic control.
0000 — A generic code that is not assigned and should not be used. 1200 — VFR aircraft. The default code for all flights–if you aren't asked to set anything else, you should set 1200. 7500 — Hijacking. 7600 — Voice radio failure.
Setting a squawk of 7700 on the transponder shows that the aircraft is presently dealing with an emergency. The pilot can set it proactively or at air traffic control's request following a 'pan' or 'mayday' call.
Photo: servickuz/Shutterstock. The first emergency code that you may have become familiar with is Squawk 7500. This code is used to indicate that the aircraft has been hijacked, and therefore requires urgent emergency support from both security services and air traffic control.
Code 7600 is the code for a loss of radio. If a pilot's radio goes out during a fight, they can enter 7600 into the transponder. Then they should proceed to their intended airport following a standard landing plan. Pilots should be extra careful and on alert for other aircraft around them in the sky.
For example, 1200 in the USA means that the flight is flying under Visual Flight Rules (VFR) and is not typically in direct contact with ATC. 1200 is a shared code so you may see many aircraft transmitting it at the same time in a given area.
Visual flight rules (VFR) flight standard squawk code used in North American airspace when no other has been assigned or is applicable. 1201. US. Assigned via FAR 93.95 for use by VFR aircraft in the immediate vicinity of LAX. US.