SSR Code

Secondary Surveillance Radar (SSR) is referred to as “secondary”, to distinguish it from the “primary radar” that works by passively reflecting a radio signal off the skin of the aircraft. Primary radar determines range and bearing to a target with reasonably high fidelity, but it cannot determine target elevation (altitude) reliably except for at close range. SSR uses an active transponder (beacon) to transmit a response to an interrogation by a secondary radar. This response most often includes the aircraft’s pressure altitude and a 4-digit octal identifier.


A transponder (short-for transmitter-responder and sometimes abbreviated to XPDR,[2] XPNDR, TPDR or TP) is an electronic device that produces a response when it receives a radio-frequency interrogation. Aircraft have transponders to assist in identifying them on air traffic control radar; and collision avoidance systems have been developed to use transponder transmissions as a means of detecting aircraft at risk of colliding with each other. Air traffic control 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” to mean “I have selected transponder code xxxx”.

International Departures

Domestic Departures From

Transit In The FIR To

International Arrivals To



6401 – 6477

North South North South Tanger/Tetouan/Al Hoceima 4201 – 4277 7000 – 7077 5100 – 5177
3401 – 3477 3601 – 3677 1401 – 1477 6201 – 6277 Rabat 4401- 4477
Casablanca 4501 – 4577
Fez/Oujda/Nador 4601 – 4677
Marrakech/Ourzazate 4701 – 4777
Agadir/Laayoune/Dakhla/Errachidia 5401- 5477


Transonpder code based on Morocco AIPs ENR 1.6 Radar services and procedures