diff --git a/Assets/UXF/Scripts/Etc/Tracker.cs b/Assets/UXF/Scripts/Etc/Tracker.cs
index fe542cb1..faea84bd 100644
--- a/Assets/UXF/Scripts/Etc/Tracker.cs
+++ b/Assets/UXF/Scripts/Etc/Tracker.cs
@@ -12,7 +12,7 @@ namespace UXF
     /// </summary>
     public abstract class Tracker : MonoBehaviour
     {
-        private static string[] baseHeaders = new string[] { "time" };
+        private static string[] baseHeaders = new string[] { };
         private TrackerState currentState = TrackerState.Stopped;
 
         /// <summary>
@@ -87,7 +87,6 @@ public void RecordRow()
                 "Tracker measurements cannot be taken when not recording!");
             
             UXFDataRow newRow = GetCurrentValues();
-            newRow.Add(("time", Time.time));
             Data.AddCompleteRow(newRow);
         }
 
diff --git a/Assets/UXF/Scripts/Trackers/MouseScreenTracker.cs b/Assets/UXF/Scripts/Trackers/MouseScreenTracker.cs
index ed86a0cf..f4df8aad 100644
--- a/Assets/UXF/Scripts/Trackers/MouseScreenTracker.cs
+++ b/Assets/UXF/Scripts/Trackers/MouseScreenTracker.cs
@@ -10,7 +10,7 @@ namespace UXF
     public class MouseScreenTracker : Tracker
     {
         public override string MeasurementDescriptor => "mouse_screen";
-        public override IEnumerable<string> CustomHeader => new string[] { "pix_x", "pix_y" };
+        public override IEnumerable<string> CustomHeader => new string[] { "time", "pix_x", "pix_y" };
 
         /// <summary>
         /// Returns current mouse position in screen coordinates
@@ -18,6 +18,8 @@ public class MouseScreenTracker : Tracker
         /// <returns></returns>
         protected override UXFDataRow GetCurrentValues()
         {
+            float time = Time.time;
+
             // get position and rotation
             Vector2 p = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
 
@@ -25,6 +27,7 @@ protected override UXFDataRow GetCurrentValues()
             // return position, rotation (x, y, z) as an array
             var values = new UXFDataRow()
             {
+                ("time", time),
                 ("pix_x", p.x),
                 ("pix_y", p.y)
             };
diff --git a/Assets/UXF/Scripts/Trackers/MouseWorldTracker.cs b/Assets/UXF/Scripts/Trackers/MouseWorldTracker.cs
index 0ce6bd11..59f76029 100644
--- a/Assets/UXF/Scripts/Trackers/MouseWorldTracker.cs
+++ b/Assets/UXF/Scripts/Trackers/MouseWorldTracker.cs
@@ -16,7 +16,7 @@ public class MouseWorldTracker : Tracker
 
         public override string MeasurementDescriptor => "mouse_world";
 
-        public override IEnumerable<string> CustomHeader => new string[] { "pos_x", "pos_y", "pos_z", };
+        public override IEnumerable<string> CustomHeader => new string[] { "time", "pos_x", "pos_y", "pos_z", };
 
         /// <summary>
         /// Returns current mouse position in world coordinates
@@ -24,12 +24,15 @@ public class MouseWorldTracker : Tracker
         /// <returns></returns>
         protected override UXFDataRow GetCurrentValues()
         {
+            float time = Time.time;
+
             // get position and rotation
             Vector3 p = mainCamera.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, distanceFromCamera));
 
             // return position, rotation (x, y, z) as an array
             var values = new UXFDataRow()
             {
+                ("time", time),
                 ("pos_x", p.x),
                 ("pos_y", p.y),
                 ("pos_z", p.z)
diff --git a/Assets/UXF/Scripts/Trackers/PositionRotationTracker.cs b/Assets/UXF/Scripts/Trackers/PositionRotationTracker.cs
index 034e6b97..d3736b0e 100644
--- a/Assets/UXF/Scripts/Trackers/PositionRotationTracker.cs
+++ b/Assets/UXF/Scripts/Trackers/PositionRotationTracker.cs
@@ -12,7 +12,7 @@ namespace UXF
     public class PositionRotationTracker : Tracker
     {
         public override string MeasurementDescriptor => "movement";
-        public override IEnumerable<string> CustomHeader => new string[] { "pos_x", "pos_y", "pos_z", "rot_x", "rot_y", "rot_z" };
+        public override IEnumerable<string> CustomHeader => new string[] { "time", "pos_x", "pos_y", "pos_z", "rot_x", "rot_y", "rot_z" };
 
         /// <summary>
         /// Returns current position and rotation values
@@ -20,6 +20,8 @@ public class PositionRotationTracker : Tracker
         /// <returns></returns>
         protected override UXFDataRow GetCurrentValues()
         {
+            float time = Time.time;
+
             // get position and rotation
             Vector3 p = gameObject.transform.position;
             Vector3 r = gameObject.transform.eulerAngles;
@@ -27,6 +29,7 @@ protected override UXFDataRow GetCurrentValues()
             // return position, rotation (x, y, z) as an array
             var values = new UXFDataRow()
             {
+                ("time", time),
                 ("pos_x", p.x),
                 ("pos_y", p.y),
                 ("pos_z", p.z),