diff --git a/View/acoustic_data_tab.py b/View/acoustic_data_tab.py
index bf9bf08..32724d7 100644
--- a/View/acoustic_data_tab.py
+++ b/View/acoustic_data_tab.py
@@ -1202,50 +1202,32 @@ class AcousticDataTab(QWidget):
             msgBox.exec()
 
             self.lineEdit_distance_from_ABS_to_free_surface.setText("0.00")
-        else:
-            stg.distance_from_ABS_to_free_surface[
-                self.fileListWidget.currentRow()
-            ] = (
-                float(
-                    self.lineEdit_distance_from_ABS_to_free_surface\
-                    .text().replace(",", ".")
-                )
-            )
-
-            self.lineEdit_distance_from_ABS_to_free_surface.setText(
-                str(
-                    "%4s" % stg.distance_from_ABS_to_free_surface[
-                        self.fileListWidget.currentRow()
-                    ]
-                )
-            )
+            return
 
     def refresh_distance_from_ABS_to_free_surface(self):
         self.pushbutton_distance_from_ABS_to_free_surface.blockSignals(True)
 
-        if self.combobox_ABS_system_choice.currentIndex() == 1:
-            acoustic_data = AcousticDataLoader(
-                stg.path_BS_raw_data[self.fileListWidget.currentRow()] + "/" +
-                stg.filename_BS_raw_data[self.fileListWidget.currentRow()]
-            )
-        elif self.combobox_ABS_system_choice.currentIndex() == 2:
-            acoustic_data = AcousticDataLoaderUBSediFlow(
-                stg.path_BS_raw_data[self.fileListWidget.currentRow()] + "/" +
-                stg.filename_BS_raw_data[self.fileListWidget.currentRow()]
+        data_id = self.fileListWidget.currentRow()
+
+        previous = stg.distance_from_ABS_to_free_surface[data_id]
+        new = (
+            float(
+                self.lineEdit_distance_from_ABS_to_free_surface\
+                .text().replace(",", ".")
             )
+        )
+        self.lineEdit_distance_from_ABS_to_free_surface.setText(f"{new}")
 
-        stg.depth[self.fileListWidget.currentRow()] = acoustic_data._r
-        stg.depth_reshape[self.fileListWidget.currentRow()] = acoustic_data.reshape_r()
+        logger.debug(f"prev: {previous}, new: {new}")
 
-        stg.depth[self.fileListWidget.currentRow()] = (
-                stg.depth[self.fileListWidget.currentRow()] +
-                stg.distance_from_ABS_to_free_surface[self.fileListWidget.currentRow()])
+        stg.depth[data_id] = stg.depth[data_id] - previous
+        stg.depth_reshape[data_id] = stg.depth_reshape[data_id] - previous
 
-        stg.depth_reshape[self.fileListWidget.currentRow()] = (
-                stg.depth_reshape[self.fileListWidget.currentRow()] +
-                stg.distance_from_ABS_to_free_surface[self.fileListWidget.currentRow()])
+        stg.depth[data_id] = stg.depth[data_id] + new
+        stg.depth_reshape[data_id] = stg.depth_reshape[data_id] + new
 
-        stg.depth_cross_section[self.fileListWidget.currentRow()] = stg.depth[self.fileListWidget.currentRow()]
+        stg.depth_cross_section[data_id] = stg.depth[data_id]
+        stg.distance_from_ABS_to_free_surface[data_id] = new
 
         self.fill_table()