https://zenwriting.net/middlecamp7/a-trip-back-in-time-what-people-talked-about-car-key-programming-near-me-20 https://www.openlearning.com/u/baunalstrup-slsi8q/blog/WhyYouShouldForgetAboutEnhancingYourKeyProgrammingCar What Are the Different Types of Codes and How Do They Work? Contrary to older keys car keys have chips in them that are unique to each car. This helps to prevent thieves from just using the key to start the car. These keys are typically purchased from the dealership or cloned by a locksmith. The procedure of the manufacturer differs, but it involves turning the ignition key to the "on" position without beginning the car, and then removing it within the specified time. Transponder Codes As its name suggests, transponders send out an encoded signal that contains a four-digit number code when it is interrogated by air traffic control. This signal, referred to as SQUAWK Code SQUAWK Code, is used to identify aircraft on radar screens. It can also be used to relay an exact message to the air traffic control system in a crisis or to inform controllers of changes in weather conditions. Squawk codes can be used to communicate with ATC when the pilot is unable communicate via radio. They are crucial for safe flying. Every aircraft has a transponder, which responds to radar probes by displaying an identifier. This allows ATC to identify the aircraft on a radar screen that is busy. Transponders can be set to respond in different ways when asked. Mode A transmits only the code while mode C transmits information about altitude. Mode S transponders provide more details including call signs and positions, which can be useful in crowded airspace. A common sight is a small beige box that is located under the pilot's seat in the majority of aircraft. The transponder is a tiny beige box that is used to transmit the SQUAWK code when air traffic control system activates the aircraft. The transponder may be set to the 'ON' the ALT, or the SBY (standby position) positions.