[gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode

[Sanjeev Gupta]

---
 www/gps-hacking.html | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/www/gps-hacking.html b/www/gps-hacking.html
index bba9b1f..d8c6aa2 100644
--- a/www/gps-hacking.html
+++ b/www/gps-hacking.html
@@ -383,6 +383,12 @@ feel for what your GPS has to say, and how often it says 
it.</p>
 
 <h1>Locking and Loading</h1>
 
+<h2>Autonomous mode</h2>
+<p>
+If a GPS receiver has to figure out its postition without outside
+assistance, it is said to be in <dfn>autonomous mode</dfn>.
+</p>
+
 <p>The time required for a GPS to get a fix (Time To First Fix (TTFF))
 can vary from under 15 seconds up to just under 30 minutes (actually,
 29 plus calculation time).  The main factors affecting this latency are
@@ -429,6 +435,14 @@ on this issue</a>.  Details about the satellite signals 
and there
 timing are <a
 href="http://www.kowoma.de/en/gps/data_composition.htm";>here</a>.</p>
 
+<h2>A-GPS mode</h2>
+<p>
+If the GPS receiver can download the almanac or ephemerides, it can proceed
+quickly to a <i>hot start</i>.  This is uncommon for GPSes that are
+connected to laptops, but is usual for GPS in mbile phones.
+<dfn>A-GPS</dfn> is variously expanded as Augmented, Assisted, or Aided.
+</p>
+
 <h1>GPSs and Power Management</h1>
 
 <p>Many GPSes are designed to power down or go to standby mode when
-- 
2.1.4