diff --git a/app/src/main/java/fr/chteufleur/mytrackingdog/MainActivity.java b/app/src/main/java/fr/chteufleur/mytrackingdog/MainActivity.java
index 8b93542..0faaa73 100644
--- a/app/src/main/java/fr/chteufleur/mytrackingdog/MainActivity.java
+++ b/app/src/main/java/fr/chteufleur/mytrackingdog/MainActivity.java
@@ -47,6 +47,7 @@ import java.util.Observer;
 
 import fr.chteufleur.mytrackingdog.models.Gpx;
 import fr.chteufleur.mytrackingdog.models.beans.MyLocation;
+import fr.chteufleur.mytrackingdog.models.beans.MyLocationArray;
 import fr.chteufleur.mytrackingdog.services.ServiceGps;
 
 public class MainActivity extends AppCompatActivity implements IOrientationConsumer, Observer {
@@ -410,10 +411,12 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
     }
 
     private void updateDogTrace() {
+        MyLocationArray listLoc = serviceGps.getListGeoPointDog();
         Polyline line = new Polyline(map);
         line.setTitle(Gpx.DOG_TRACE_NAME);
+        line.setSubDescription("Départ: "+listLoc.getFirstLocation().getDatePrint());
         line.setColor(Color.BLUE);
-        line.setPoints(convertListLocation(serviceGps.getListGeoPointDog()));
+        line.setPoints(convertListLocation(listLoc));
         line.setWidth(LINE_WIDTH_BIG);
         line.setGeodesic(true);
         line.setInfoWindow(new BasicInfoWindow(R.layout.bonuspack_bubble, map));
@@ -422,10 +425,12 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
     }
 
     private void updateTrailTrace() {
+        MyLocationArray listLoc = serviceGps.getListGeoPointTraceur();
         Polyline line = new Polyline(map);
         line.setTitle(Gpx.TRAIL_TRACE_NAME);
+        line.setSubDescription("Départ: "+listLoc.getFirstLocation().getDatePrint());
         line.setColor(Color.RED);
-        line.setPoints(convertListLocation(serviceGps.getListGeoPointTraceur()));
+        line.setPoints(convertListLocation(listLoc));
         line.setWidth(LINE_WIDTH_BIG);
         line.setGeodesic(true);
         line.setInfoWindow(new BasicInfoWindow(R.layout.bonuspack_bubble, map));
@@ -461,7 +466,7 @@ public class MainActivity extends AppCompatActivity implements IOrientationConsu
         }
     }
 
-    private List<GeoPoint> convertListLocation(List<MyLocation> list) {
+    private List<GeoPoint> convertListLocation(MyLocationArray list) {
         List<GeoPoint> ret = new ArrayList<>();
         if (list != null) {
             for (MyLocation loc : list) {
diff --git a/app/src/main/java/fr/chteufleur/mytrackingdog/models/Traces.java b/app/src/main/java/fr/chteufleur/mytrackingdog/models/Traces.java
index b3cd513..cd8d509 100644
--- a/app/src/main/java/fr/chteufleur/mytrackingdog/models/Traces.java
+++ b/app/src/main/java/fr/chteufleur/mytrackingdog/models/Traces.java
@@ -6,14 +6,15 @@ import java.util.ArrayList;
 import java.util.List;
 
 import fr.chteufleur.mytrackingdog.models.beans.MyLocation;
+import fr.chteufleur.mytrackingdog.models.beans.MyLocationArray;
 
 public class Traces {
 
     private static final String TAG = Traces.class.getName();
 
-    private List<MyLocation> listPointTraceur = new ArrayList<>();
-    private List<MyLocation> listPointDog = new ArrayList<>();
-    private List<MyLocation> listPointObjects = new ArrayList<>();
+    private MyLocationArray listPointTraceur = new MyLocationArray();
+    private MyLocationArray listPointDog = new MyLocationArray();
+    private MyLocationArray listPointObjects = new MyLocationArray();
 
     private boolean traceurActivated = false;
     private boolean dogActivated = false;
@@ -38,13 +39,13 @@ public class Traces {
             addPointDog(point);
         }
     }
-    public List<MyLocation> getListPointTraceur() {
+    public MyLocationArray getListPointTraceur() {
         return listPointTraceur;
     }
-    public List<MyLocation> getListPointDog() {
+    public MyLocationArray getListPointDog() {
         return listPointDog;
     }
-    public List<MyLocation> getListPointObjects() {
+    public MyLocationArray getListPointObjects() {
         return listPointObjects;
     }
 
diff --git a/app/src/main/java/fr/chteufleur/mytrackingdog/models/beans/MyLocation.java b/app/src/main/java/fr/chteufleur/mytrackingdog/models/beans/MyLocation.java
index 95797e0..3aae3ce 100644
--- a/app/src/main/java/fr/chteufleur/mytrackingdog/models/beans/MyLocation.java
+++ b/app/src/main/java/fr/chteufleur/mytrackingdog/models/beans/MyLocation.java
@@ -56,6 +56,13 @@ public class MyLocation {
         return formaterDate.format(date)+"T"+formaterTime.format(date)+"Z";
     }
 
+    public String getDatePrint() {
+        Date date = new Date(this.time);
+        SimpleDateFormat formaterDate = new SimpleDateFormat("yyyy-MM-dd");
+        SimpleDateFormat formaterTime = new SimpleDateFormat("HH:mm:ss");
+        return formaterDate.format(date)+" "+formaterTime.format(date);
+    }
+
     public double getAltitude() {
         return this.altitude;
     }
diff --git a/app/src/main/java/fr/chteufleur/mytrackingdog/models/beans/MyLocationArray.java b/app/src/main/java/fr/chteufleur/mytrackingdog/models/beans/MyLocationArray.java
new file mode 100644
index 0000000..11c1a72
--- /dev/null
+++ b/app/src/main/java/fr/chteufleur/mytrackingdog/models/beans/MyLocationArray.java
@@ -0,0 +1,30 @@
+package fr.chteufleur.mytrackingdog.models.beans;
+
+import java.util.ArrayList;
+
+public class MyLocationArray extends ArrayList<MyLocation> {
+
+    private MyLocation firstLocation = null;
+    private MyLocation lastLocation = null;
+
+
+    @Override
+    public boolean add(MyLocation loc) {
+        if (firstLocation == null || loc.getTime() < firstLocation.getTime()) {
+            firstLocation = loc;
+        }
+
+        if (lastLocation == null || loc.getTime() > lastLocation.getTime()) {
+            lastLocation = loc;
+        }
+        return super.add(loc);
+    }
+
+    public MyLocation getFirstLocation() {
+        return firstLocation;
+    }
+
+    public MyLocation getLastLocation() {
+        return lastLocation;
+    }
+}
diff --git a/app/src/main/java/fr/chteufleur/mytrackingdog/services/ServiceGps.java b/app/src/main/java/fr/chteufleur/mytrackingdog/services/ServiceGps.java
index 37e7942..b772858 100644
--- a/app/src/main/java/fr/chteufleur/mytrackingdog/services/ServiceGps.java
+++ b/app/src/main/java/fr/chteufleur/mytrackingdog/services/ServiceGps.java
@@ -22,6 +22,7 @@ import fr.chteufleur.mytrackingdog.models.Gpx;
 import fr.chteufleur.mytrackingdog.models.ImportGpx;
 import fr.chteufleur.mytrackingdog.models.Traces;
 import fr.chteufleur.mytrackingdog.models.beans.MyLocation;
+import fr.chteufleur.mytrackingdog.models.beans.MyLocationArray;
 import fr.chteufleur.mytrackingdog.models.beans.TraceLocation;
 import fr.chteufleur.mytrackingdog.models.beans.WayPointLocation;
 
@@ -152,13 +153,13 @@ public class ServiceGps extends Observable implements IServiceGps, LocationListe
         return currentLocation;
     }
 
-    public List<MyLocation> getListGeoPointTraceur() {
+    public MyLocationArray getListGeoPointTraceur() {
         return traces.getListPointTraceur();
     }
-    public List<MyLocation> getListGeoPointDog() {
+    public MyLocationArray getListGeoPointDog() {
         return traces.getListPointDog();
     }
-    public List<MyLocation> getListGeoPointObjects() {
+    public MyLocationArray getListGeoPointObjects() {
         return traces.getListPointObjects();
     }