| 100% | MARCONI | 7 | Developed radio telegraph system, Guglielmo |
| 50% | AMSTEREO | 8 | Radio system developed by Motorola |
| 35% | GPS | 3 | Radio navigation system (abbr) |
| 34% | UNIX | 4 | System developed at Bell Laboratories |
| 34% | UNIX | 4 | System developed by Bell Labs |
| 34% | UNIX | 4 | System developed at Bell Labs |
| 33% | MARCONI | 7 | Guglielmo —, Italian physicist who developed radiotelegraphy |
| 33% | MARCONI | 7 | Radio transmission pioneer Guglielmo |
| 32% | ANDROID | 7 | Operating system developed by Google |
| 32% | MORSE | 5 | Samuel ___, American inventor who pioneered the single-wire telegraph system |
| 31% | UNIX | 4 | Operating system developed at Bell Labs |
| 31% | UNIX | 4 | Computer system developed at Bell Labs |
| 31% | UNIX | 4 | Operating system developed by Bell Labs |
| 31% | AUTOPILOT | 9 | Driver-assistance system developed by Tesla |
| 31% | ASCII | 5 | Computer system derived from telegraph code |
| 31% | MARCONI | 7 | Pioneer of radio transmission: Guglielmo __ |
| 31% | WIRELESS | 8 | Communication system that uses radio signals |
| 31% | RADAR | 5 | Detection system that uses radio waves |
| 30% | LORAN | 5 | Radio navigation system to determine their position and speed |
| 30% | UNIX | 4 | Computer operating system developed by Bell Labs |
| 30% | UNIX | 4 | Computer operating system developed at Bell Labs |
| 30% | KRAVMAGA | 8 | Self-defense system developed by Imi Lichtenfeld |
| 29% | IOS | 3 | Popular mobile phone operating system developed by Apple |
| 29% | MEMCACHED | 9 | Open-source caching system first developed in 2003 |
| 29% | UNIX | 4 | Operating system that was developed at Bell Labs |
| 29% | UNIX | 4 | Computer operating system developed in the nineteen-sixties |
| 29% | SRS | 3 | Description of a software system to be developed (abbr) |
| 29% | ROID | 4 | Suffix with "and" (mobile operating system developed by Google) |
| 27% | KONMARIMETHOD | 13 | System of 18-Across and tidying up developed by 42-Across (2 wds.) |
| 26% | LORAN | 5 | Long-distance radio navigation system |