diff --git a/plugins/samplesource/filesource/filesourcegui.cpp b/plugins/samplesource/filesource/filesourcegui.cpp
index 45e7b8743..5d7524b2e 100644
--- a/plugins/samplesource/filesource/filesourcegui.cpp
+++ b/plugins/samplesource/filesource/filesourcegui.cpp
@@ -303,7 +303,7 @@ void FileSourceGui::on_play_toggled(bool checked)
 
 void FileSourceGui::on_navTimeSlider_valueChanged(int value)
 {
-	if (m_enableNavTime && ((value >= 0) && (value <= 100)))
+	if (m_enableNavTime && ((value >= 0) && (value <= 1000)))
 	{
 		FileSourceInput::MsgConfigureFileSourceSeek* message = FileSourceInput::MsgConfigureFileSourceSeek::create(value);
 		m_sampleSource->getInputMessageQueue()->push(message);
@@ -387,7 +387,7 @@ void FileSourceGui::updateWithStreamTime()
 	if (!m_enableNavTime)
 	{
 		float posRatio = (float) t_sec / (float) m_recordLength;
-		ui->navTimeSlider->setValue((int) (posRatio * 100.0));
+		ui->navTimeSlider->setValue((int) (posRatio * 1000.0));
 	}
 }
 
diff --git a/plugins/samplesource/filesource/filesourcegui.ui b/plugins/samplesource/filesource/filesourcegui.ui
index 221fb8771..f40501a14 100644
--- a/plugins/samplesource/filesource/filesourcegui.ui
+++ b/plugins/samplesource/filesource/filesourcegui.ui
@@ -558,7 +558,7 @@
         <string>Time navigator</string>
        </property>
        <property name="maximum">
-        <number>100</number>
+        <number>1000</number>
        </property>
        <property name="pageStep">
         <number>1</number>
diff --git a/plugins/samplesource/filesource/filesourceinput.cpp b/plugins/samplesource/filesource/filesourceinput.cpp
index af33296f3..4f8ed2175 100644
--- a/plugins/samplesource/filesource/filesourceinput.cpp
+++ b/plugins/samplesource/filesource/filesourceinput.cpp
@@ -138,13 +138,13 @@ void FileSourceInput::openFileStream()
 	}
 }
 
-void FileSourceInput::seekFileStream(int seekPercentage)
+void FileSourceInput::seekFileStream(int seekMillis)
 {
 	QMutexLocker mutexLocker(&m_mutex);
 
 	if ((m_ifstream.is_open()) && m_fileSourceThread && !m_fileSourceThread->isRunning())
 	{
-        quint64 seekPoint = ((m_recordLength * seekPercentage) / 100) * m_sampleRate;
+        quint64 seekPoint = ((m_recordLength * seekMillis) / 1000) * m_sampleRate;
 		m_fileSourceThread->setSamplesCount(seekPoint);
         seekPoint *= (m_sampleSize == 24 ? 8 : 4); // + sizeof(FileSink::Header)
 		m_ifstream.clear();
@@ -322,8 +322,8 @@ bool FileSourceInput::handleMessage(const Message& message)
 	else if (MsgConfigureFileSourceSeek::match(message))
 	{
 		MsgConfigureFileSourceSeek& conf = (MsgConfigureFileSourceSeek&) message;
-		int seekPercentage = conf.getPercentage();
-		seekFileStream(seekPercentage);
+		int seekMillis = conf.getMillis();
+		seekFileStream(seekMillis);
 
 		return true;
 	}
diff --git a/plugins/samplesource/filesource/filesourceinput.h b/plugins/samplesource/filesource/filesourceinput.h
index 66c1c501c..b5683d65a 100644
--- a/plugins/samplesource/filesource/filesourceinput.h
+++ b/plugins/samplesource/filesource/filesourceinput.h
@@ -113,19 +113,19 @@ public:
 		MESSAGE_CLASS_DECLARATION
 
 	public:
-		int getPercentage() const { return m_seekPercentage; }
+		int getMillis() const { return m_seekMillis; }
 
-		static MsgConfigureFileSourceSeek* create(int seekPercentage)
+		static MsgConfigureFileSourceSeek* create(int seekMillis)
 		{
-			return new MsgConfigureFileSourceSeek(seekPercentage);
+			return new MsgConfigureFileSourceSeek(seekMillis);
 		}
 
 	protected:
-		int m_seekPercentage; //!< percentage of seek position from the beginning 0..100
+		int m_seekMillis; //!< millis of seek position from the beginning 0..1000
 
-		MsgConfigureFileSourceSeek(int seekPercentage) :
+		MsgConfigureFileSourceSeek(int seekMillis) :
 			Message(),
-			m_seekPercentage(seekPercentage)
+			m_seekMillis(seekMillis)
 		{ }
 	};
 
@@ -319,7 +319,7 @@ public:
 	const QTimer& m_masterTimer;
 
 	void openFileStream();
-	void seekFileStream(int seekPercentage);
+	void seekFileStream(int seekMillis);
 	bool applySettings(const FileSourceSettings& settings, bool force = false);
     void webapiFormatDeviceReport(SWGSDRangel::SWGDeviceReport& response);
 };