diff --git a/Observer.h b/Observer.h
index e0a9786..26a7936 100644
--- a/Observer.h
+++ b/Observer.h
@@ -7,6 +7,20 @@ class Observer {
 public:
     Observer(void);
     virtual ~Observer(void);
+
+    void SetLocation(const CoordGeodetic& geo) {
+        geo_ = geo;
+    }
+
+    CoordGeodetic GetLocation() const {
+        return geo_;
+    }
+
+private:
+    /*
+     * the observers position
+     */
+    CoordGeodetic geo_;
 };
 
 #endif
diff --git a/Rewrite.vcxproj b/Rewrite.vcxproj
index 4e51701..2659507 100644
--- a/Rewrite.vcxproj
+++ b/Rewrite.vcxproj
@@ -75,6 +75,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="Coord.cpp" />
+    <ClCompile Include="Eci.cpp" />
     <ClCompile Include="Globals.cpp" />
     <ClCompile Include="Julian.cpp" />
     <ClCompile Include="main.cpp" />
@@ -85,6 +86,7 @@
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Coord.h" />
+    <ClInclude Include="Eci.h" />
     <ClInclude Include="Globals.h" />
     <ClInclude Include="Julian.h" />
     <ClInclude Include="Observer.h" />
diff --git a/Rewrite.vcxproj.filters b/Rewrite.vcxproj.filters
index ad1c8fb..6a3137c 100644
--- a/Rewrite.vcxproj.filters
+++ b/Rewrite.vcxproj.filters
@@ -39,6 +39,9 @@
     <ClCompile Include="Observer.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="Eci.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Coord.h">
@@ -65,5 +68,8 @@
     <ClInclude Include="Observer.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="Eci.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file