| No. | Item | Definition |
|---|---|---|
| 1. | accuracy | closeness to true measurement |
| 2. | acquire | detect and begin tracking |
| 3. | aircraft | vehicle that flies |
| 4. | airspace | the sky above a region |
| 5. | alert | warning of possible threat |
| 6. | alignment | proper positioning of components |
| 7. | altitude | height above a reference level |
| 8. | antenna | device that transmits or receives radio |
| 9. | azimuth | horizontal angle from reference north |
| 10. | bandit | identified hostile aircraft |
| 11. | bandwidth | range of usable frequencies |
| 12. | beam | focused radio energy pattern |
| 13. | bearing | direction to a target |
| 14. | blind spot | area not visible to radar |
| 15. | blip | small spot on a radar screen |
| 16. | bogey | unidentified aircraft target |
| 17. | boundary | line marking an area’s limit |
| 18. | calibration | adjustment for correct measurement |
| 19. | classify | assign target to a type |
| 20. | cloud | visible mass of condensed vapor |
| 21. | clutter | unwanted echoes from surroundings |
| 22. | contact | detected object of interest |
| 23. | course | intended direction of travel |
| 24. | coverage | area the radar can observe |
| 25. | cue | signal to focus attention |
| 26. | dead zone | area with no useful coverage |
| 27. | departure | act of leaving |
| 28. | diffraction | bending of waves around obstacles |
| 29. | divert | change to a different route |
| 30. | doppler | frequency shift from motion |
| 31. | drone | uncrewed aircraft |
| 32. | east | direction of sunrise |
| 33. | echo | returned radar signal |
| 34. | filter | device removing unwanted components |
| 35. | fix | known reference position |
| 36. | frequency | number of wave cycles per second |
| 37. | friendly | belonging to allied forces |
| 38. | gain | amplification of signal strength |
| 39. | grid | network of reference lines |
| 40. | ground | earth’s surface |
| 41. | heading | direction a vessel or aircraft points |
| 42. | hold | remain in a waiting pattern |
| 43. | hostile | belonging to opposing forces |
| 44. | identify | determine what the target is |
| 45. | inbound | coming toward a point |
| 46. | intercept | meet a moving target |
| 47. | interference | disruption from other signals |
| 48. | jam | disrupt signals deliberately |
| 49. | line-of-sight | direct path between points |
| 50. | link | connection between systems or units |
| 51. | lock | hold tracking on a target |
| 52. | mask | hide or obscure a signal |
| 53. | missile | guided flying weapon |
| 54. | navigation | planning and following a route |
| 55. | noise | unwanted random signal interference |
| 56. | north | direction toward the North Pole |
| 57. | operator | person who runs the radar |
| 58. | orbit | circular holding path |
| 59. | outbound | moving away from a point |
| 60. | overtake | pass a slower moving object |
| 61. | patrol | regular watch over an area |
| 62. | phase | position within a wave cycle |
| 63. | port | left side of a vessel |
| 64. | position | current location |
| 65. | power | strength of transmitted signal |
| 66. | pulse | brief burst of radio energy |
| 67. | radar | system using radio to detect objects |
| 68. | rain | falling water droplets |
| 69. | range | distance to a target |
| 70. | receiver | part that detects returned signals |
| 71. | reconnaissance | information gathering by observation |
| 72. | report | give information formally |
| 73. | resolution | ability to separate close targets |
| 74. | return | signal reflected back to radar |
| 75. | scan | searching motion of the beam |
| 76. | scope | radar display screen |
| 77. | sea | large body of salt water |
| 78. | sector | portion of the scanned area |
| 79. | south | direction opposite north |
| 80. | speed | rate of movement |
| 81. | starboard | right side of a vessel |
| 82. | sweep | rotating scan of radar beam |
| 83. | target | object being tracked |
| 84. | terrain | physical features of the ground |
| 85. | threat | possible hostile target or hazard |
| 86. | threshold | minimum level for detection |
| 87. | trace | visible path of movement |
| 88. | track | follow a target over time |
| 89. | trail | series of past target marks |
| 90. | transmitter | part that sends radio energy |
| 91. | unknown | not yet identified |
| 92. | update | latest revised information |
| 93. | vector | direct using heading information |
| 94. | velocity | speed with direction |
| 95. | vessel | ship or large boat |
| 96. | wavelength | distance between wave peaks |
| 97. | waypoint | named navigation reference point |
| 98. | weather | atmospheric conditions |
| 99. | west | direction of sunset |
| 100. | zone | defined area or region |