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@@ -22,3 +22,17 @@
 [JAPAN](JAPAN)
 
 [GPS](GPS)
+
+# PART.2 : ERRORS
+
+[Errors : Introduction](Errors : Introduction)
+
+[The clock synchronization problem](The clock synchronization problem)
+
+[Ionospheric and tropospheric error](Ionospheric and tropospheric error)
+
+[The errors - Orbital errors](The errors - Orbital errors)
+
+[Multipath Signaling](Multipath Signaling)
+
+[Bonus : Why do you need 4 satellites to locate someone?](Why do you need 4 satellites to locate someone?)