| A simple intruding airplane proximity warning. |
| The intruder relative position and possibly an indication of a collision avoidance manoeuvre within the vertical plane only. |
| The intruder relative position and possibly an indication of a collision avoidance manoeuvre within the horizontal plane only. |
| The intruder relative position and possibly an indication of a collision avoidance manoeuvre within both the vertical and horizontal planes. |
EN 