Global Positioning System Message format Subframe1

| Subframe_ | Page_ | Name_ | Word_ | Bits | Scale_ | Signed |
|---|---|---|---|---|---|---|
| 1 | all | Week Number | 3 | 1–10 | 1:1 | No |
| 1 | all | CA or P On L2 | 3 | 1112 | 1:1 | No |
| 1 | all | URA Index | 3 | 13–16 | 1:1 | No |
| 1 | all | SV_Health | 3 | 17–22 | 1:1 | No |
| 1 | all | IODC(MSB) | 3 | 2324 | 1:1 | No |
| 1 | all | L2Pdata flag | 4 | 1 | 1:1 | No |
| 1 | all | ResW4 | 4 | 2–24 | N/A | N/A |
| 1 | all | ResW5 | 5 | 1–24 | N/A | N/A |
| 1 | all | ResW6 | 6 | 1–24 | N/A | N/A |
| 1 | all | ResW7 | 7 | 1–16 | N/A | N/A |
| 1 | all | TGD | 7 | 17–24 | 2^-31 | Yes |
| 1 | all | IODC (LSB) | 8 | 1–8 | 1:1 | No |
| 1 | all | TOC | 8 | 9–24 | 2^4 | No |