diff --git a/mission/controller/acs/Guidance.cpp b/mission/controller/acs/Guidance.cpp
index afd4d41e..e46abe37 100644
--- a/mission/controller/acs/Guidance.cpp
+++ b/mission/controller/acs/Guidance.cpp
@@ -292,6 +292,11 @@ void Guidance::targetQuatPtgThreeAxes(ACS::SensorValues *sensorValues,
   QuaternionOperations::multiply(quatBJ, quatInertialTarget, targetQuat);
 }
 
+void Guidance::targetQuatPtgGs(ACS::SensorValues *sensorValues, acsctrl::MekfData *mekfData,
+                               acsctrl::SusDataProcessed *susDataProcessed,
+                               acsctrl::GpsDataProcessed *gpsDataProcessed, timeval now,
+                               double targetQuat[4], double refSatRate[3]) {}
+
 void Guidance::sunQuatPtg(ACS::SensorValues *sensorValues, acsctrl::MekfData *mekfData,
                           acsctrl::SusDataProcessed *susDataProcessed,
                           acsctrl::GpsDataProcessed *gpsDataProcessed, timeval now,
diff --git a/mission/controller/acs/Guidance.h b/mission/controller/acs/Guidance.h
index 176d51a2..80993a0d 100644
--- a/mission/controller/acs/Guidance.h
+++ b/mission/controller/acs/Guidance.h
@@ -27,6 +27,10 @@ class Guidance {
                               acsctrl::GpsDataProcessed *gpsDataProcessed,
                               acsctrl::MekfData *mekfData, timeval now, double targetQuat[4],
                               double refSatRate[3]);
+  void targetQuatPtgGs(ACS::SensorValues *sensorValues, acsctrl::MekfData *mekfData,
+                       acsctrl::SusDataProcessed *susDataProcessed,
+                       acsctrl::GpsDataProcessed *gpsDataProcessed, timeval now,
+                       double targetQuat[4], double refSatRate[3]);
   void targetQuatPtgSingleAxis(ACS::SensorValues *sensorValues, acsctrl::MekfData *mekfData,
                                acsctrl::SusDataProcessed *susDataProcessed,
                                acsctrl::GpsDataProcessed *gpsDataProcessed, timeval now,