diff --git a/matlab/GPSaidedINS_cycling.m b/matlab/GPSaidedINS_cycling.m
index aa17f2be29c9224a3c5f4d4e764bbce598e666b9..42a00c6535b07b3237c9bb46d0bba27559c0090f 100644
--- a/matlab/GPSaidedINS_cycling.m
+++ b/matlab/GPSaidedINS_cycling.m
@@ -164,7 +164,7 @@ for k=start_sim:start_sim+length_sim
     out_data.diag_P(:,k)=diag(P);
     out_data.delta_u_h(:,k)=delta_u_h;
     out_data.sv(k)=sv;
-    out_data.turn(k)=turn;
+    out_data.turn(k-start_sim+1)=turn;
 end
 
 %% output for simulation of energy-accuracy tradeoff