EXAMPLE − 8/15/19 AIM  Surveillance Systems 4 − 5 − 4 1. Areas of precipitation (can be reduced by CP) 2. Arrival/departure tabular list 3. Trackball (control) position symbol (A) 4. Airway (lines are sometimes deleted in part) 5. Radar limit line for control 6. Obstruction (video map) 7. Primary radar returns of obstacles or terrain (can be removed by MTI) 8. Satellite airports 9. Runway centerlines (marks and spaces indicate miles) 10. Primary airport with parallel runways 11. Approach gates 12. Tracked target (primary and beacon target) 13. Control position symbol 14. Untracked target select code (monitored) with Mode C readout of 5,000’ 15. Untracked target without Mode C 16. Primary target 17. Beacon target only (secondary radar) (transponder) 18. Primary and beacon target 19. Leader line 20. Altitude Mode C readout is 6,000’  (Note: readouts may not be displayed because of nonreceipt of beacon information, garbled beacon signals, and flight plan data which is displayed alternately with the altitude readout) 21. Ground speed readout is 240 knots  (Note: readouts may not be displayed because of a loss of beacon signal, a controller alert that a pilot was squawking emergency, radio failure, etc.) 22. Aircraft ID 23. Asterisk indicates a controller entry in Mode C block. In this case 5,000’ is entered and “05” would alternate with Mode C readout. 24. Indicates heavy 46. System data area 45. Time 44. Altimeter setting 43. General information (ATIS, runway, approach in use) 42. Select beacon codes (being monitored) 41. Radio failure (emergency information) 40. Coast/suspend list (aircraft holding, temporary loss of beacon/target, etc.) 39. Targets in suspend status 38. Aircraft controlled by center 37. Range marks (10 and 15 miles) (can be changed/offset) 36. Untracked target identing on a selected code 35. Identing target blossoms 34. Ident flashes 33. Controller assigned runway 36 right alternates with Mode C readout  (Note: a three letter identifier could also indicate the arrival is at specific airport) 29. Nonmonitored. No Mode C (an asterisk would indicate nonmonitored with Mode C) 30. Beacon target only (secondary radar based on aircraft transponder) 31. Tracked target (primary and beacon target) control position A 32. Aircraft is squawking emergency Code 7700 and is nonmonitored, untracked, Mode C 28. Primary target only 27. Airways 26. NAVAIDs 25. “Low ALT” flashes to indicate when an aircraft’s predicted descent places the aircraft in an unsafe proximity to terrain.  (Note: this feature does not function if the aircraft is not squawking Mode C. When a helicopter or aircraft is known to be operating below the lower safe limit, the “low ALT” can be changed to “inhibit” and flashing ceases.)