diff --git a/gps.conf b/gps.conf
index 6ad636b..a73bcdd 100644
--- a/gps.conf
+++ b/gps.conf
@@ -3,11 +3,20 @@
 # below will be ignored, and instead the servers will
 # be queried from the modem.
 XTRA_SERVER_QUERY=0
+
+# URLs from which to download XTRA data
 # XTRA_SERVERs below are used only if XTRA_SERVER_QUERY
 # is off.
-XTRA_SERVER_1=http://xtrapath1.izatcloud.net/xtra2.bin
-XTRA_SERVER_2=http://xtrapath2.izatcloud.net/xtra2.bin
-XTRA_SERVER_3=http://xtrapath3.izatcloud.net/xtra2.bin
+XTRA_SERVER_1=https://xtrapath1.izatcloud.net/xtra3grc.bin
+XTRA_SERVER_2=https://xtrapath2.izatcloud.net/xtra3grc.bin
+XTRA_SERVER_3=https://xtrapath3.izatcloud.net/xtra3grc.bin
+
+#Version check for XTRA
+#DISABLE = 0
+#AUTO    = 1
+#XTRA2   = 2
+#XTRA3   = 3
+XTRA_VERSION_CHECK=1
 
 # Error Estimate
 # _SET = 1