Astronautics RoadRunner AFI4700 - No Bearing Intruders; Figure 3-25: TCAS no Bearing

PLG12863E AFI4700 Pilot’s Guide 72
3.3.7.4 No Bearing Intruders
When the TCAS is unable to track the bearing of an intruder, the EFI
will display the TA distance, altitude, and trend next to the TCAS bezel
legend. The EFI will display up to three No-Bearing intruders next to
the TCAS button legend.
Figure 3-25: TCAS No Bearing