diff --git a/src/modules/map/components/cesium/CesiumMouseTracker.vue b/src/modules/map/components/cesium/CesiumMouseTracker.vue
index 5d0a5c2b8..32d1d4baf 100644
--- a/src/modules/map/components/cesium/CesiumMouseTracker.vue
+++ b/src/modules/map/components/cesium/CesiumMouseTracker.vue
@@ -1,7 +1,7 @@
 <script setup>
 import { Cartographic, Math, ScreenSpaceEventHandler, ScreenSpaceEventType } from 'cesium'
-import { transform } from 'ol/proj'
-import { computed, inject, nextTick, onMounted, onUnmounted, ref, watch } from 'vue'
+import proj4 from 'proj4'
+import { computed, inject, nextTick, onBeforeUnmount, onMounted, ref, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useStore } from 'vuex'
 
@@ -38,9 +38,10 @@ onMounted(() => {
     })
 })
 
-onUnmounted(() => {
+onBeforeUnmount(() => {
     if (handler) {
         handler.removeInputAction(ScreenSpaceEventType.MOUSE_MOVE)
+        handler.destroy()
     }
 })
 
@@ -57,7 +58,7 @@ function setupHandler() {
             const cartographic = Cartographic.fromCartesian(cartesian)
             const longitude = Math.toDegrees(cartographic.longitude)
             const latitude = Math.toDegrees(cartographic.latitude)
-            let coordinate = transform([longitude, latitude], 'EPSG:4326', projection.value)
+            let coordinate = proj4('EPSG:4326', projection.value.getCode(), [longitude, latitude])
             coordinate.push(cartographic.height)
 
             mousePosition.value.textContent = formatCoordinate(coordinate)
diff --git a/src/utils/coordinates/CoordinateSystem.class.js b/src/utils/coordinates/CoordinateSystem.class.js
index 66480464b..ccc1a94f2 100644
--- a/src/utils/coordinates/CoordinateSystem.class.js
+++ b/src/utils/coordinates/CoordinateSystem.class.js
@@ -207,9 +207,9 @@ export default class CoordinateSystem {
     }
 
     /**
-     * Returns the EPSG number of this coordinate system
+     * Returns the EPSG identifier of this coordinate system
      *
-     * @returns {Number}
+     * @returns {String}
      */
     getCode() {
         return `EPSG:${this.epsgNumber}`