getting to grips with surveillance(62)

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Relative altitude  ADS-B  TCAS  The TCAS function determines the relative altitude thanks to the barometric altitude reported in Mode C or S. 
Altitude  ADS-B  TCAS  The TCAS function determines the altitude thanks to the barometric altitude reported in Mode C or S. 
Heading  ADS-B  N/A 
Track  ADS-B  N/A 
Bearing  ADS-B  N/A  Calculated from GPS positions of ADS-B and own aircraft. 
Distance  ADS-B  N/A  Calculated from GPS positions of ADS-B and own aircraft. Refer to C.2.5 – ITP Distance. 

When some pieces of information are missing, the TCAS computer displays:
-
On ND: Only available information

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On MCDU: Dashes in appropriate fields (except wake vortex category).

The TCAS computer uses the GPS position to locate the own aircraft.

3.6.5. ATSAW CONTROLS
With ATSAW controls, the flight crew can:
-Highlight and/or select an aircraft on ND
-
Display or hide ATSAW symbols on ND

-
Display or hide flight numbers for all ATSAW symbols on ND.

The ATSAW controls except the selection function are limited to the own side ND. The Captain and the First Officer can independently highlight, display, or hide ATSAW symbols and flight numbers on their own ND. However, when one flight crewmember selects one aircraft on his ND (with the traffic selector or with the MCDU TRAFFIC SELECT function), the ND of the other flight crewmember also displays the selection.
The selected aircraft is a common reference for both flight crewmembers.
3.6.5.1. MCDU CONTROLS
3.6.5.1.1. TRAF ON/OFF
The TRAF ON/OFF function in the TRAFFIC LIST page (refer to Figure 3-19) displays or hides ATSAW symbols on ND.
When the TRAF ON/OFF function is set to OFF, the TCAS computer:
-Removes ADS-B Only symbols from ND
-Replaces TCAS+ADS-B symbols by TCAS Only symbols on ND (refer to
3.6.4.1.1 – TCAS and ATSAW Symbols)
-Permits the display of the Traffic List on MCDU.
The TRAF ON/OFF function affects the own side ND only.
3.6.5.1.2. FLT ID ON/OFF
The FLT ID ON/OFF in the TRAFFIC LIST and the ITP TRAFFIC LIST pages (refer to Figure 3-19 and Figure 3-22) displays or hides flight numbers of all ATSAW symbols on ND (refer to extended label in Figure 3-12). The FLT ID ON/OFF function is not available when the TRAF ON/OFF function is set to OFF.
The FLT ID ON/OFF function affects the own side ND only.
3.6.5.1.3. TRAFFIC SELECT/DESELECT
The TRAFFIC SELECT/DESELECT function in the TRAFFIC INFORMATION page selects or deselects the given aircraft. The selection/de-selection is accordingly updated on ND. The TRAFFIC SELECT/DESELECT function is coordinated with the Traffic Selector (refer to 3.6.5.2 – Traffic Selector). Note: In any TRAF page, the flight number follows the same legend when the flight crew:
　
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