diff --git a/Aircraft-yasim/dc3.xml b/Aircraft-yasim/dc3.xml
index 3b4024895..68953a769 100644
--- a/Aircraft-yasim/dc3.xml
+++ b/Aircraft-yasim/dc3.xml
@@ -7,7 +7,7 @@
   <control-setting axis="/controls/engines/engine[1]/mixture" value="1.0"/>
   <control-setting axis="/controls/engines/engine[0]/propeller-pitch" value="0.5"/>
   <control-setting axis="/controls/engines/engine[1]/propeller-pitch" value="0.5"/>
-  <control-setting axis="/contorls/flight/flaps" value="1.0"/>
+  <control-setting axis="/controls/flight/flaps" value="1.0"/>
   <control-setting axis="/controls/gear/gear-down" value="1"/>
 </approach>
 <cruise speed="180" alt="23200">
@@ -19,7 +19,7 @@
   <control-setting axis="/controls/engines/engine[1]/propeller-pitch" value="1.0"/>
   <control-setting axis="/controls/engines/engine[0]/boost" value="1.0"/>
   <control-setting axis="/controls/engines/engine[1]/boost" value="1.0"/>
-  <control-setting axis="/contorls/flight/flaps" value="0.0"/>
+  <control-setting axis="/controls/flight/flaps" value="0.0"/>
   <control-setting axis="/controls/gear/gear-down" value="0"/>
 </cruise>
 
@@ -33,7 +33,7 @@
   <stall aoa="14" width="6" peak="1.5"/>
   <flap0 start="0.04" end="0.38" lift="1.5" drag="1.2"/>
   <flap1 start="0.38" end="0.97" lift="1.2" drag="1.2"/>
-  <control-input axis="/contorls/flight/flaps" control="FLAP0"/>
+  <control-input axis="/controls/flight/flaps" control="FLAP0"/>
   <control-input axis="/controls/flight/aileron" control="FLAP1" split="true"/>
   <control-input axis="/controls/flight/aileron-trim" control="FLAP1" split="true"/>
   <control-output control="FLAP0" prop="/surface-positions/flap-pos-norm"/>
diff --git a/Protocol/README.Protocol b/Protocol/README.Protocol
index 157c9cbea..32a4e189e 100644
--- a/Protocol/README.Protocol
+++ b/Protocol/README.Protocol
@@ -2,7 +2,7 @@ The generic communication protocol for FlightGear provides a powerfull way
 of adding a simple ASCII based output only protocol, just by defining an
 XML encoded configuration file.
 
-The definition of the protocol consists of variable seperators, line seperators,
+The definition of the protocol consists of variable separators, line separators,
 and chuncks of text.
 
 Each chunck defines:
@@ -23,14 +23,14 @@ Each chunck defines:
 		(for example, degrees Celsius to degrees Fahrenheit).
 
 
-The output section also could define the variable seperator and line seperator.
+The output section also could define the variable separator and line separator.
 
-The seperators can be either a control character such as a tab or newline, or a
+The separators can be either a control character such as a tab or newline, or a
 user specified string or other single charachter. The currently supported
 control charachters are:
 
-<var_seperator>:
-<line_seperator>:
+<var_separator>:
+<line_separator>:
 Name		Charachter
 
 newline		'\n'
@@ -41,7 +41,7 @@ verticaltab	'\v'
 
 any other charachters just need to be added to "Network/generic.cxx"
 
-The var_seperator is placed between each variable, while the line_seperator is
+The var_separator is placed between each variable, while the line_separator is
 placed at the end of each lot of variables.
 
 
@@ -55,8 +55,8 @@ following:
  <generic>
 
   <output>
-   <line_seperator>newline</line_seperator>
-   <var_seperator>newline</var_seperator>
+   <line_separator>newline</line_separator>
+   <var_separator>newline</var_separator>
 
    <chunk>
     <name>speed</name>
diff --git a/Protocol/f1serial.xml b/Protocol/f1serial.xml
index 353e32149..afa11fd01 100644
--- a/Protocol/f1serial.xml
+++ b/Protocol/f1serial.xml
@@ -5,8 +5,8 @@
  <generic>
 
   <output>
-   <line_seperator>newline</line_seperator>
-   <var_seperator>newline</var_seperator>
+   <line_separator>newline</line_separator>
+   <var_separator>newline</var_separator>
 
    <chunk>
     <name>speed</name>
diff --git a/gui/dialogs/weather.xml b/gui/dialogs/weather.xml
index 56ef04f5c..c7b0074b4 100644
--- a/gui/dialogs/weather.xml
+++ b/gui/dialogs/weather.xml
@@ -148,7 +148,7 @@
    <y>0</y>
    <width>80</width>
    <height>25</height>
-   <property>/environment/config/aloft/entry[4]/dewpoint-degC</property>
+   <property>/environment/config/aloft/entry[4]/dewpoint-degc</property>
   </input>
 
   <input>
@@ -224,7 +224,7 @@
    <y>0</y>
    <width>80</width>
    <height>25</height>
-   <property>/environment/config/aloft/entry[3]/dewpoint-degC</property>
+   <property>/environment/config/aloft/entry[3]/dewpoint-degc</property>
   </input>
 
   <input>
@@ -300,7 +300,7 @@
    <y>0</y>
    <width>80</width>
    <height>25</height>
-   <property>/environment/config/aloft/entry[2]/dewpoint-degC</property>
+   <property>/environment/config/aloft/entry[2]/dewpoint-degc</property>
   </input>
 
   <input>
@@ -376,7 +376,7 @@
    <y>0</y>
    <width>80</width>
    <height>25</height>
-   <property>/environment/config/aloft/entry[1]/dewpoint-degC</property>
+   <property>/environment/config/aloft/entry[1]/dewpoint-degc</property>
   </input>
 
   <input>
@@ -452,7 +452,7 @@
    <y>0</y>
    <width>80</width>
    <height>25</height>
-   <property>/environment/config/aloft/entry[0]/dewpoint-degC</property>
+   <property>/environment/config/aloft/entry[0]/dewpoint-degc</property>
   </input>
 
   <input>
@@ -596,7 +596,7 @@
    <y>0</y>
    <width>80</width>
    <height>25</height>
-   <property>/environment/config/boundary/entry[2]/dewpoint-degC</property>
+   <property>/environment/config/boundary/entry[2]/dewpoint-degc</property>
   </input>
 
   <input>
@@ -672,7 +672,7 @@
    <y>0</y>
    <width>80</width>
    <height>25</height>
-   <property>/environment/config/boundary/entry[1]/dewpoint-degC</property>
+   <property>/environment/config/boundary/entry[1]/dewpoint-degc</property>
   </input>
 
   <input>
@@ -748,7 +748,7 @@
    <y>0</y>
    <width>80</width>
    <height>25</height>
-   <property>/environment/config/boundary/entry[0]/dewpoint-degC</property>
+   <property>/environment/config/boundary/entry[0]/dewpoint-degc</property>
   </input>
 
   <input>
diff --git a/menu.xml b/menu.xml
index 905a5ef2c..904916969 100644
--- a/menu.xml
+++ b/menu.xml
@@ -18,7 +18,7 @@
     <call>reInit</call>
     </option>
    <option>
-    <seperator/>
+    <separator/>
    </option>
    <option>
     <name>strings/hi-res-snap-shot</name>
@@ -85,7 +85,7 @@
     <call>fgPresetAirspeed</call>
    </option>
    <option>
-    <seperator/>
+    <separator/>
    </option>
    <option>
     <name>strings/preset-commit</name>
@@ -130,7 +130,7 @@
     <call>NewAltitude</call>
    </option>
    <option>
-    <seperator/>
+    <separator/>
    </option>
    <option>
     <name>strings/add-waypoint</name>
@@ -145,7 +145,7 @@
     <call>ClearRoute</call>
    </option>
    <option>
-    <seperator/>
+    <separator/>
    </option>
    <option>
     <name>strings/adjust-ap-settings</name>