ATPL: Mode A or C garbling may occur to:
Domanda 142, Radio Navigation - ATPL - Airline Transport Pilot license
| Two or more aircraft in the same direction from the interrogator with a difference in slant range of less than 1.7NM |
| Two or more aircraft different directions from the interrogator at the same altitude with a difference in slant range of less than 1.7NM |
| Two or more aircraft different directions from the ground station at the same altitude with a difference in slant range of more than 1.7NM |
| Two modes, each 1024 codes |
