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List:       gpsd-commit-watch
Subject:    [Gpsd-commit-watch] r1841 - trunk
From:       esr () sheep ! berlios ! de (Eric S !  Raymond at BerliOS)
Date:       2005-02-26 18:05:04
Message-ID: 200502261805.j1QI547D008251 () sheep ! berlios ! de
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Author: esr
Date: 2005-02-26 19:04:52 +0100 (Sat, 26 Feb 2005)
New Revision: 1841

Modified:
   trunk/TODO
   trunk/gpsd.xml
Log:
Documentation improvements.


Modified: trunk/TODO
===================================================================
--- trunk/TODO	2005-02-26 17:56:14 UTC (rev 1840)
+++ trunk/TODO	2005-02-26 18:04:52 UTC (rev 1841)
@@ -1,3 +1,7 @@
+** Display EPE and DOP in xgps
+
+We should show posiion uncertainty as well as position in the test client.
+
 ** Detect a Garmin USB device
 
 According to Hermann Kneissel:

Modified: trunk/gpsd.xml
===================================================================
--- trunk/gpsd.xml	2005-02-26 17:56:14 UTC (rev 1840)
+++ trunk/gpsd.xml	2005-02-26 18:04:52 UTC (rev 1841)
@@ -73,9 +73,10 @@
 
 <para>Optionally, <application>gpsd</application> may get
 differential-GPS corrections from a ground station running a RTCM-S104
-server; this will improve position-fix accuracy from roughly 10 meters
+server; this will improve user error (UERE) from roughly 8 meters
 to roughly 2 meters, provided you are within 1000 kilometers or so of
-the ground station.</para>
+the ground station.  (Actual error will be UERE times a dilution
+factor dependent on current satellite position.)</para>
 
 <para>The program accepts the following options:</para>
 <variablelist remap='TP'>
@@ -214,8 +215,8 @@
 &mdash; total, horizontal, and vertical (2-sigma or 95% confidence
 level).  Note: many GPSses do not supply these numbers.  When the
 GPS does not supply them, <application>gpsd</application> computes
-them using fixed figures for expected non-DGPS and DGPS range errors
-in meters.  See also the 'q' command.</para>
+them from satellite DOP using fixed figures for expected non-DGPS 
+and DGPS range errors in meters.  See also the 'q' command.</para>
 </listitem>
 </varlistentry>
 


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