| SA | Selective Availability, 선택 사용 |
| SC-104 | Special Committee-104, RTCM |
| schema | 스키마(골격) |
| scintillation | 섬광 |
| SDTS | Spatial Data Transfer Standard |
| SGML | 문서구조화 표준언어 |
| sidereal day | 항성일 |
| SIF | Standard Interchange Format |
| simulation | 모의실험 |
| single-difference | 단일차분 |
| single frequency receiver | 단일 주파수 수신기 |
| spatial feature | 공간 형상 |
| spatial reference | 공간기준 |
| SPCS | State Plane Coordinate Systems |
| SPS | Standard Positioning Service 표준위치정보 |
| STEP | STandard for the Exchange of Product model data, ISO 10303, represent product data and its internal relations or structure |
| stratosphere | 성층권 |
| subset | 부분집합 |