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AIM 

6/17/21 

EXAMPLE

 

Target symbols: 

1.  Uncorrelated primary radar target 

[

] [

+

2.  Correlated primary radar target

 [

See note below. 

3.  Uncorrelated beacon target

 [

 /

 ] 

4.  Correlated beacon target 

\

 ] 

5.  Identing beacon target

 [

Note: in Number 2 correlated means the association of 

radar data with the computer projected track of an 
identified aircraft. 

Position symbols: 

6.  Free track (no flight plan tracking)

 [

7.  Flat track (flight plan tracking) 

[

à

8.  Coast (beacon target lost)

 [

#

9.  Present position hold 

Data block information: 

10.  Aircraft ident 

See note below. 

11.  Assigned altitude FL 280, Mode C altitude same or 
within 

 

 200’ of assigned altitude. 

See note below. 

12.  Computer ID #191, handoff is to sector 33
      (0

33 would mean handoff accepted) 

See note below. 

13.  Assigned altitude 17,000’, aircraft is climbing, 
Mode C readout was 14,300 when last beacon interroga-
tion was received. 

14.  Leader line connecting target symbol and data block 

15.  Track velocity and direction vector line (projected 
ahead of target) 

16.  Assigned altitude 7,000, aircraft is descending, last 
Mode C readout (or last reported altitude) was 100’ above 
FL 230 

17.  Transponder code shows in full data block only when 
different than assigned code 

18.  Aircraft is 300’ above assigned altitude 

19.  Reported altitude (no Mode C readout) same as 
assigned. (An “n” would indicate no reported altitude.) 

20. Transponder set on emergency Code 7700 (EMRG 
flashes to attract attention) 

21.  Transponder Code 1200 (VFR) with no Mode C 

22.  Code 1200 (VFR) with Mode C and last altitude 
readout 

23.  Transponder set on radio failure Code 7600 (RDOF 
flashes) 

24.  Computer ID #228, CST indicates target is in coast 
status 

25.  Assigned altitude FL 290, transponder code (these two 
items constitute a “limited data block”) 

Note: numbers 10, 11, and 12 constitute a “full data 

block” 

Other symbols: 

26.  Navigational aid 

27.  Airway or jet route 

28.  Outline of weather returns based on primary radar. 
“H” represents areas of high density precipitation which 
might be thunderstorms. Radial lines indicated lower 
density precipitation. 

29.  Obstruction 

30.  Airports 

Major: 
Small: 

4

5

Surveillance Systems