diff -r 76f3a96e82b5 -r c3a781b4d35b src/ChartCarbonate.cpp
--- a/src/ChartCarbonate.cpp	Fri Feb 10 14:06:47 2023 +0100
+++ b/src/ChartCarbonate.cpp	Fri Feb 10 17:28:46 2023 +0100
@@ -120,12 +120,30 @@
 
 void ChartCarbonate::savePNG()
 {
-    QString path = QFileDialog::getSaveFileName(this, tr("Save Image"), QDir::homePath() + "/carbonation.png", tr("Image (*.png)"));
+    QSettings settings(QSettings::IniFormat, QSettings::UserScope, "mbse", "bmsapp");
+    QString dirName;
+
+    /*
+     * First check if the directory stored in the settings file exists.
+     * It might be on a removable media that was last used ...
+     * If so, fallback to the user's home directory.
+     */
+    dirName = settings.value("paths/download").toString();
+    if (! QDir(dirName).exists()) {
+	dirName = QDir::homePath();
+    }
+
+    QString path = QFileDialog::getSaveFileName(this, tr("Save Image"), dirName + "/carbonation.png", tr("Image (*.png)"));
     if (path.isEmpty()) {
 	QMessageBox::warning(this, tr("Save File"), tr("No image file selected."));
 	return;
     }
 
+    /*
+     * Update to current selected path
+     */
+    settings.setValue("paths/download", QFileInfo(path).absolutePath());
+
     QImage img((chartView->size()), QImage::Format_ARGB32);
     QPainter painter;
     painter.begin(&img);