diff --git a/app/src/main/java/uca/baptistearthur/geocaching/ui/fragment/EditRoadtripMap.kt b/app/src/main/java/uca/baptistearthur/geocaching/ui/fragment/EditRoadtripMap.kt
index e8e861d..b963a9d 100644
--- a/app/src/main/java/uca/baptistearthur/geocaching/ui/fragment/EditRoadtripMap.kt
+++ b/app/src/main/java/uca/baptistearthur/geocaching/ui/fragment/EditRoadtripMap.kt
@@ -6,39 +6,42 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import org.osmdroid.bonuspack.routing.OSRMRoadManager
-import org.osmdroid.views.MapView
+import org.osmdroid.util.BoundingBox
+import org.osmdroid.util.GeoPoint
 import uca.baptistearthur.geocaching.model.RoadTripEntity
-import uca.baptistearthur.geocaching.ui.overlay.AddMarkerOverlay
 import uca.baptistearthur.geocaching.ui.overlay.EditMarkerOverlay
-import uca.baptistearthur.geocaching.ui.overlay.MarkerOverlay
-import uca.baptistearthur.geocaching.ui.overlay.EditRoadtripOverlay
+import kotlin.math.ln
+import kotlin.math.roundToInt
+import kotlin.math.sqrt
 
-class EditRoadtripMap : Map() {
 
-    companion object{
-        const val defaultZoomLevel = 10.0
-    }
+class EditRoadtripMap : Map() {
 
     var roadTrip: RoadTripEntity? = null
     set(value) {
         roadTrip?:
             value?.let {
-                val editMarkerOverlay = EditMarkerOverlay(OSRMRoadManager(context, userAgent), value)
-                editMarkerOverlay.addPlaces(value.places, map)
-                map.overlays.add(editMarkerOverlay);
-                map.controller.setCenter(value.places.first())
+                addEditMarkerOverlay(value)
+                getMapParams(value).let{
+                    map.controller.setCenter(it.first)
+                    map.controller.setZoom(it.second)
+                }
                 field = value
             }
     }
 
-    override fun onCreateView(
-        inflater: LayoutInflater, container: ViewGroup?,
-        savedInstanceState: Bundle?
-    ): View? {
-        Log.d("GeoMap", "CREATE EDIT MAP")
-        val view = super.onCreateView(inflater, container, savedInstanceState)
-        map.controller.setZoom(defaultZoomLevel)
-        return view
+    private fun addEditMarkerOverlay(roadTrip: RoadTripEntity){
+        val editMarkerOverlay = EditMarkerOverlay(OSRMRoadManager(context, userAgent), roadTrip)
+        editMarkerOverlay.addPlaces(roadTrip.places, map)
+        map.overlays.add(editMarkerOverlay);
+    }
+
+    private fun getMapParams(roadTrip: RoadTripEntity): Pair<GeoPoint, Double>{
+        val boundingBox = BoundingBox.fromGeoPoints(roadTrip.places)
+        val maxDistance = 7000000.0
+        val logZoom = (defaultZoomLevel - minimumZoomLevel) * ln(boundingBox.diagonalLengthInMeters) / ln(maxDistance)
+        val zoomLevel = (defaultZoomLevel - logZoom).coerceIn(minimumZoomLevel, defaultZoomLevel)
+        return Pair(boundingBox.centerWithDateLine, zoomLevel)
     }
 
 }
\ No newline at end of file
diff --git a/app/src/main/java/uca/baptistearthur/geocaching/ui/overlay/EditMarkerOverlay.kt b/app/src/main/java/uca/baptistearthur/geocaching/ui/overlay/EditMarkerOverlay.kt
index 5f0de1c..1fc004d 100644
--- a/app/src/main/java/uca/baptistearthur/geocaching/ui/overlay/EditMarkerOverlay.kt
+++ b/app/src/main/java/uca/baptistearthur/geocaching/ui/overlay/EditMarkerOverlay.kt
@@ -6,7 +6,7 @@ import org.osmdroid.util.GeoPoint
 import org.osmdroid.views.MapView
 import uca.baptistearthur.geocaching.model.RoadTripEntity
 
-class EditMarkerOverlay(roadManager: RoadManager, val roadTrip: RoadTripEntity) : MarkerOverlay<EditRoadtripOverlay>(roadManager) {
+class EditMarkerOverlay(roadManager: RoadManager, var roadTrip: RoadTripEntity) : MarkerOverlay<EditRoadtripOverlay>(roadManager) {
 
     fun addPlaces(geopoints: Collection<GeoPoint>, mapView: MapView)=
         geopoints.forEach {
diff --git a/app/src/main/java/uca/baptistearthur/geocaching/ui/overlay/EditRoadtripOverlay.kt b/app/src/main/java/uca/baptistearthur/geocaching/ui/overlay/EditRoadtripOverlay.kt
index 09dd4bd..f4c794f 100644
--- a/app/src/main/java/uca/baptistearthur/geocaching/ui/overlay/EditRoadtripOverlay.kt
+++ b/app/src/main/java/uca/baptistearthur/geocaching/ui/overlay/EditRoadtripOverlay.kt
@@ -1,6 +1,10 @@
 package uca.baptistearthur.geocaching.ui.overlay
 
+import android.app.AlertDialog
 import android.content.Context
+import android.text.InputFilter
+import android.util.Log
+import android.widget.EditText
 import android.widget.Toast
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.ViewModelStoreOwner
@@ -15,6 +19,7 @@ import uca.baptistearthur.geocaching.model.Place
 import uca.baptistearthur.geocaching.model.RoadTripEntity
 import uca.baptistearthur.geocaching.viewModels.RoadTripViewModel
 import uca.baptistearthur.geocaching.viewModels.RoadTripViewModelFactory
+import java.util.*
 
 class EditRoadtripOverlay(points: MutableCollection<PlaceMarker>, val roadTripEntity: RoadTripEntity) : ConfirmationOverlay(points) {
 
@@ -25,13 +30,14 @@ class EditRoadtripOverlay(points: MutableCollection<PlaceMarker>, val roadTripEn
             RoadTripViewModel::class.java)
     }
 
-    override fun confirm(mapView: MapView) {
-        val places: MutableList<Place> = points.map { Place(it.position.latitude, it.position.longitude) }.toMutableList()
+    private fun onValidation(mapView: MapView, input: String) {
+        val places: MutableList<Place> =
+            points.map { Place(it.position.latitude, it.position.longitude) }.toMutableList()
         CoroutineScope(Dispatchers.Main).launch {
-            places.filter{it.address.displayName==="unknown"}.forEach{ it.initAddress() }
+            places.filter { it.address.displayName === "unknown" }.forEach { it.initAddress() }
             val newRoadTrip = RoadTripEntity(
                 id = roadTripEntity.id,
-                name = roadTripEntity.name,
+                name = input,
                 date = roadTripEntity.date,
                 places = places
             )
@@ -42,7 +48,33 @@ class EditRoadtripOverlay(points: MutableCollection<PlaceMarker>, val roadTripEn
                 R.string.changesSaved,
                 Toast.LENGTH_SHORT
             ).show()
-
         }
     }
+
+    override fun confirm(mapView: MapView) {
+        val input = EditText(mapView.context)
+        input.setText(roadTripEntity.name)
+        input.filters = arrayOf<InputFilter>(InputFilter.LengthFilter(50))
+
+        val dialog = AlertDialog.Builder(mapView.context)
+            .setTitle(R.string.newRoadtripDialog)
+            .setView(input)
+            .setPositiveButton(R.string.confirm) { _, _ ->
+                val userInput = input.text.toString()
+                if (userInput.isNotBlank()) {
+                    onValidation(mapView, input.text.toString())
+                } else {
+                    Toast.makeText(
+                        mapView.context,
+                        R.string.emptyTextError,
+                        Toast.LENGTH_SHORT
+                    ).show()
+                }
+            }
+            .setNegativeButton(R.string.cancel) { dialog, _ ->
+                dialog.cancel()
+            }
+            .create()
+        dialog.show()
+    }
 }
\ No newline at end of file