diff --git a/eive_tmtc/tmtc/acs/acs_ctrl.py b/eive_tmtc/tmtc/acs/acs_ctrl.py
index 06a194c..ca5042c 100644
--- a/eive_tmtc/tmtc/acs/acs_ctrl.py
+++ b/eive_tmtc/tmtc/acs/acs_ctrl.py
@@ -95,7 +95,7 @@ CTRL_STRAT_DICT = {
 GPS_COURCE_DICT = {
     0: "NONE",
     1: "GPS",
-    2: "PROPAGATION",
+    2: "GPS_EXTRAPOLATED",
     3: "SGP4",
 }