EXAMPLE-
Target symbols:

1. Uncorrelated primary radar target [d] [+]

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

2. Correlated primary radar target []
:See note below.

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

3. Uncorrelated beacon target [ / ]

18. Aircraft is 300" above assigned altitude

4. Correlated beacon target [ \ ]

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

5. Identing beacon target [5]
:Note: in Number 2 correlated means the association of
radar data with the computer projected track of an
identified aircraft.
Position symbols:

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

6. Free track (no flight plan tracking) [n]
7. Flat track (flight plan tracking) []
8. Coast (beacon target lost) [#]

23. Transponder set on radio failure Code 7600 (RDOF
flashes)
24. Computer ID #228, CST indicates target is in coast
status

9. Present position hold [  ]
Data block information:

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

10. Aircraft ident
:See note below.

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

11. Assigned altitude FL 280, Mode C altitude same or
within  200" of assigned altitude.
:See note below.

Other symbols:

12. Computer ID #191, handoff is to sector 33
(0-33 would mean handoff accepted)
:See note below.

27. Airway or jet route

13. Assigned altitude 17,000", aircraft is climbing,
Mode C readout was 14,300 when last beacon interrogation was received.

26. Navigational aid

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

14. Leader line connecting target symbol and data block
30. Airports
15. Track velocity and direction vector line (projected
ahead of target)

4-5-6

Major:
Small:

Surveillance Systems