diff options
| author | Eric S. Raymond <esr@thyrsus.com> | 2007-12-12 23:59:54 +0000 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2007-12-12 23:59:54 +0000 |
| commit | 430213a9fe8ae23b3b83d29b2ce50011941f4a52 (patch) | |
| tree | d40cf1bb07a9bde16238e7487c5625965565cf36 /www | |
| parent | 1a457240750a979eb7c2cd28dd40d201e29d7d73 (diff) | |
| download | gpsd-430213a9fe8ae23b3b83d29b2ce50011941f4a52.tar.gz | |
Removed wired-in NTP offset from the NMEA driver.
Revised the table on the hardware page to reflect user reports.
Diffstat (limited to 'www')
| -rw-r--r-- | www/hardware.html | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/www/hardware.html b/www/hardware.html index 9c1866fb..9cbc1875 100644 --- a/www/hardware.html +++ b/www/hardware.html @@ -1177,24 +1177,28 @@ although it is not clear if the "consumer" firmware is capable of that. <h2>PPS and GPSD:</h2> <p>Many GPS receivers offer a 1PPS (one pulse per second) output that - GPSD is capable of passing along to ntp for use as an extremely - accurate clock source. The following information on 1PPS accuracy - are taken from manufacturers' data sheets, and have not been - independently verified.</p> + GPSD is capable of passing along to <code>ntpd</code> for use as an + extremely accurate clock source. The "Claimed Accuracy" are taken + from manufacturers' data sheets, and have not been independently + verified.</p> + + <p>Where specified, NTP time offsets have been measured by + comparison with the NTP time service and reported by + <code>gpsd</code>.</p> <div> </div> <table border='1'> <tr> <th>Receiver</th> -<th>Claimed<br>Accuracy</th> -<th>1PPS Tested<br>with GPSD</th> +<th>Claimed<br/>Accuracy</th> +<th>NTP time offset</th> <th>Notes</th> </tr> <tr> <td>Trimble Lassen iQ</td> <td align="center">50ns</td> -<td align="center">-</td> +<td align="center">0.675sec</td> <td align="center">-</td> </tr> <tr> @@ -1204,10 +1208,16 @@ although it is not clear if the "consumer" firmware is capable of that. <td align="center">-</td> </tr> <tr> -<td>Garmin GPS18</td> +<td>Garmin GPS18/USB</td> <td align="center">1usec</td> +<td align="center">0.100sec</td> <td align="center">-</td> -<td align="center">-</td> +</tr> +<tr> +<td>Garmin GPS18/LVC</td> +<td align="center">1usec</td> +<td align="center">0.125sec</td> +<td align="center">At 19200bps; drops to 0.525 at 4800bps</td> </tr> <tr> <td>SiRFstar2</td> @@ -1270,8 +1280,8 @@ although it is not clear if the "consumer" firmware is capable of that. <td align="center">-</td> </tr> <tr> -<td>Motorola<br>iLotus<br>Synergy-GPS M12M</td> -<td align="center">20ns<br>6ns corrected</td> +<td>Motorola<br>iLotus<br/>Synergy-GPS M12M</td> +<td align="center">20ns<br/>6ns corrected</td> <td align="center">-</td> <td align="center">-</td> </tr> |