This format is generated by the Locosys GT-11, GT-31, GW-52 and GW-60.
The packed SiRF binary format consists of 32 byte messages which originate from the Geodetic Navigation Data.
| SiRF Name | Raw Name | Type | Name | Type | Units | Resolution |
|---|---|---|---|---|---|---|
| HDOP | hdop | u1 | hdop | float32 | - | 2 x 10-1 |
| Number of SVs in Fix | sv_count | u1 | sat | uint8 | - | - |
| UTC Milliseconds | utc_millisecs | <u2 | ts | float64 | s | 1 x 10-3 |
| UTC Packed Datetime 1 | utc_packed_datetime | <u4 | ts | float64 | s | 1 x 10-3 |
| Satellite ID List | sv_ids | <u4 | svids | uint32 | - | - |
| Latitude | latitude | <i4 | lat | float64 | deg | 1 x 10-7 |
| Longitude | longitude | <i4 | lon | float64 | deg | 1 x 10-7 |
| Altitude from MSL | altitude_msl | <i4 | ele | float64 | m | 1 x 10-2 |
| Speed Over Ground (SOG) | sog | <u2 | sog | float32 | m/s | 1 x 10-2 |
| Course Over Ground (COG, True) | cog | <u2 | cog | float32 | deg | 1 x 10-2 |
| Climb Rate | climb_rate | <i2 | roc | float32 | m/s | 1 x 10-2 |
| Speed Dilution of Precision | sdop | u1 | ehve | float32 | m/s | 1 x 10-2 |
| Vertical Speed Dilution of Precision | vsdop | u1 | evve | float32 | m/s | 1 x 10-2 |
Notes:
During the testing of the GPS Wizard modules, it was observed that GPSResults does not handle SDOP and VSDOP being unavailable in SBP files. This results in +/- figures of 0.000 being reported by GPSResults for SBP tracks missing SDOP and VSDOP which is incorrect / misleading.
GPS Wizard will ignore the last 2 bytes of the SBP files when SDOP and VSDOP are unpopulated; e.g. GT-11 tracks.