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authorEric S. Raymond <esr@thyrsus.com>2015-01-27 12:07:08 -0500
committerEric S. Raymond <esr@thyrsus.com>2015-01-27 12:07:08 -0500
commit09e5cc69d6599c743d8b8df22d60f6d582b8dc11 (patch)
treef347ce0ec72dd35e2ca54dff34825ea43737e3a9 /www
parent89392c9bc88b5615a2f7fccea327e3e53b0041e9 (diff)
downloadgpsd-09e5cc69d6599c743d8b8df22d60f6d582b8dc11.tar.gz
Minor date tweaks to Time Service HOWTO.
Diffstat (limited to 'www')
-rw-r--r--www/gpsd-time-service-howto.txt15
1 files changed, 9 insertions, 6 deletions
diff --git a/www/gpsd-time-service-howto.txt b/www/gpsd-time-service-howto.txt
index 427a7980..be4c0c3e 100644
--- a/www/gpsd-time-service-howto.txt
+++ b/www/gpsd-time-service-howto.txt
@@ -223,9 +223,10 @@ polled in the same order every second. When a device is added it is
assigned to one of those 1024 polling slots. It should then be clear
that the accuracy of a USB 1.1 connected GPS would be about 1 mSec.
-As of late 2013 no USB GPS we know of implements the higher polling-rate
-options in USB 2 and 3. When one does, and if it has the Macx-1 mod,
-higher USB accuracy will ensue.
+As of early 2015 no USB GPS we know of implements the higher
+polling-rate options in USB 2 and 3 or the interrupt capability in
+USB 3. When one does, and if it has the Macx-1 mod, higher USB
+accuracy will ensue.
.Summary of typical accuracy
|=======================================
@@ -322,7 +323,7 @@ are unlikely to be significant to you; flip a coin.
== Choice of Hardware ==
To get 1PPS to your NTP daemon, you first need to get it from a
-PPS-capable GPS. As of late 2013 this means either the previously
+PPS-capable GPS. As of early 2015 this means either the previously
mentioned GR601-W or a serial GPS with 1PPS.
You can find 1PPS-capable devices supported by GPSD at <<HARDWARE>>.
@@ -356,7 +357,7 @@ is a relatively inexpensive but high-quality navigation GPS. We make a
note of this because u-blox also has a specialized timing variant, the
LEA 6T, which would be expensive overkill for an NTP server.
-Unfortunately as of late 2013 the LEA-6H is still hard to find in a
+Unfortunately as of early 2015 the LEA-6H is still hard to find in a
packaged RS232 version, as opposed to a bare OEM module exporting TTL
levels or an eval kit like the EVK 6H-0-001 costing upwards of
US$300. Search the web; you may find a here-today-gone-tomorrow offer
@@ -694,7 +695,7 @@ xtime-a.timefreq .ACTS. 1 u 40 64 377 59.228 -8.503 0.516
+SHM(0) .GPS. 0 l 50 64 377 0.000 6.631 5.331
-----------------------------------------------------------------------------
-The line with refid ".GPS." represents the in-band time reportts from
+The line with refid ".GPS." represents the in-band time reports from
your GPS. When you are getting PPS then it may look like this:
-----------------------------------------------------------------------------
@@ -1175,3 +1176,5 @@ Shawn Kohlsmith <skohlsmith@gmail.com> tweaked the Bibliography.
1.3, Aug 2014: Add a note about the GR-601W.
1.4, Dec 2014: Cleaned up Bibliography
+
+Repository: Minor corrections to dates.