Many GPS receivers offer a 1PPS (one pulse per second) output that
GPSD is capable of passing along to ntpd for use as an
extremely accurate clock source. The "Claimed Accuracy" are taken
from manufacturers' data sheets, and have not been independently
verified.
Where specified, NTP time offsets have been measured by
comparison with the NTP time service and reported by
gpsd.
| Receiver | Claimed Accuracy |
NTP time offset | Notes |
|---|---|---|---|
| SigNav TM3-01 | 10ns | - | - |
| Trimble Thunderbolt E | 15ns | - | - |
| Trimble Resolution-T | 15ns | - | - |
| Motorola iLotus Synergy-GPS M12M |
20ns 6ns corrected |
- | - |
| NavSync CW25-TIM | 25ns | - | - |
| NavSync CW12-TIM | 30ns | - | - |
| Motorola OnCore UT+ | 50ns | - | - |
| Trimble Lassen iQ | 50ns | 0.675sec | - |
| Trimble Copernicus | 50ns | - | - |
| ublox Antaris | 50ns | - | - |
| ublox Antaris4 | 50ns | - | - |
| ublox Antaris4T | 50ns 15ns compensated |
- | - |
| Novatel SuperStarII | 200ns | - | - |
| Thales AC12 | 250ns | - | - |
| Garmin GPS18/USB | 1usec | 0.100sec | - |
| Garmin GPS18/LVC | 1usec | 0.125sec | At 19200bps; drops to 0.525 at 4800bps |
| Rockwell Jupiter | 1usec | - | - |
| SiRFstar2 | 1usec | - | - |
| SiRFstar3 | 1usec | - | - |