diff --git a/src/PamView/component/DataBlockTableView.java b/src/PamView/component/DataBlockTableView.java
index af5918cf..3b9b87e7 100644
--- a/src/PamView/component/DataBlockTableView.java
+++ b/src/PamView/component/DataBlockTableView.java
@@ -249,6 +249,18 @@ public abstract class DataBlockTableView<T extends PamDataUnit> {
 		}
 	}
 	
+	/**
+	 * Get the data unit for the selected data row
+	 * @return
+	 */
+	public T getSelectedDataUnit() {
+		int row = testTable.getSelectedRow();
+		if (row < 0) {
+			return null;
+		}
+		return getDataUnit(row);
+	}
+	
 	/**
 	 * Get the number of rows in the table - default behaviour is the 
 	 * number of rows in the datablock, but this may be overridden if
@@ -344,7 +356,7 @@ public abstract class DataBlockTableView<T extends PamDataUnit> {
 	}
 	
 	public void popupMenuAction(MouseEvent e, T dataUnit, String colName) {
-		
+//		System.out.println("Pop");
 	}
 
 	private void showPopupMenu(MouseEvent e) {
diff --git a/src/detectiongrouplocaliser/dialogs/DetectionGroupTable.java b/src/detectiongrouplocaliser/dialogs/DetectionGroupTable.java
index 3dd7ecb8..fc48befa 100644
--- a/src/detectiongrouplocaliser/dialogs/DetectionGroupTable.java
+++ b/src/detectiongrouplocaliser/dialogs/DetectionGroupTable.java
@@ -338,7 +338,7 @@ public class DetectionGroupTable extends UserDisplayComponentAdapter implements
 	 * 
 	 * @return which data row is selected, or null.
 	 */
-	private DetectionGroupDataUnit getSelectedDataRow() {
+	public DetectionGroupDataUnit getSelectedDataRow() {
 		int row = table.getSelectedRow();
 		if (row < 0 || dataCopy == null || row >= dataCopy.size()) {
 			return null;
diff --git a/src/pamScrollSystem/AbstractScrollManager.java b/src/pamScrollSystem/AbstractScrollManager.java
index e1485a4d..60de4983 100644
--- a/src/pamScrollSystem/AbstractScrollManager.java
+++ b/src/pamScrollSystem/AbstractScrollManager.java
@@ -104,6 +104,13 @@ public abstract class AbstractScrollManager {
 	 */
 	abstract public void centreDataAt(PamDataBlock dataBlock, long menuMouseTime);
 
+	/**
+	 * Move scroll to given time. Don't move the outer scroller unless necessary. 
+	 * @param dataBlock
+	 * @param menuMouseTime
+	 */
+	abstract public void scrollToTime(PamDataBlock dataBlock, long menuMouseTime);
+
 	/**
 	 * Start all data in all data blocks at the given time
 	 * @param dataBlock
diff --git a/src/pamScrollSystem/PamScrollSlider.java b/src/pamScrollSystem/PamScrollSlider.java
index bb1062ad..8b908b12 100644
--- a/src/pamScrollSystem/PamScrollSlider.java
+++ b/src/pamScrollSystem/PamScrollSlider.java
@@ -93,11 +93,12 @@ public class PamScrollSlider extends AbstractPamScrollerAWT {
 	}
 
 	@Override
-	void doMouseWheelAction(MouseWheelEvent mouseWheelEvent) {
+	public void doMouseWheelAction(MouseWheelEvent mouseWheelEvent) {
 		int n = mouseWheelEvent.getWheelRotation();
 		slider.setValue(slider.getValue() - n);
 		scrollMoved();
 	}
+	
 	public void scrollMoved() {
 		AbstractScrollManager.getScrollManager().moveInnerScroller(this, getValueMillis());	
 		notifyValueChange();
@@ -146,6 +147,7 @@ public class PamScrollSlider extends AbstractPamScrollerAWT {
 	public long getVisibleAmount() {
 		return 0;
 	}
+
 	/* (non-Javadoc)
 	 * @see pamScrollSystem.AbstractPamScroller#setRangeMillis(long, long, boolean)
 	 */
diff --git a/src/pamScrollSystem/RealTimeScrollManager.java b/src/pamScrollSystem/RealTimeScrollManager.java
index 662cfdf3..ecb9ef7c 100644
--- a/src/pamScrollSystem/RealTimeScrollManager.java
+++ b/src/pamScrollSystem/RealTimeScrollManager.java
@@ -59,4 +59,10 @@ public class RealTimeScrollManager extends AbstractScrollManager {
 		return newMin;
 	}
 
+	@Override
+	public void scrollToTime(PamDataBlock dataBlock, long menuMouseTime) {
+		// TODO Auto-generated method stub
+		
+	}
+
 }
diff --git a/src/pamScrollSystem/ViewerScrollerManager.java b/src/pamScrollSystem/ViewerScrollerManager.java
index 82159a4d..dba01fae 100644
--- a/src/pamScrollSystem/ViewerScrollerManager.java
+++ b/src/pamScrollSystem/ViewerScrollerManager.java
@@ -17,6 +17,7 @@ import PamController.PamControllerInterface;
 import PamController.PamGUIManager;
 import PamController.PamSettingManager;
 import PamController.PamSettings;
+import PamUtils.PamCalendar;
 import PamguardMVC.PamDataBlock;
 import PamguardMVC.dataOffline.OfflineDataLoadInfo;
 import PamguardMVC.superdet.SuperDetDataBlock;
@@ -624,20 +625,52 @@ public class ViewerScrollerManager extends AbstractScrollManager implements PamS
 	public void centreDataAt(PamDataBlock dataBlock, long menuMouseTime) {
 		// centre all scroll bars as close to the above as is possible.
 		AbstractPamScroller aScroller;
-		long scrollRange, newMax, newMin;
 		for (int i = 0; i < pamScrollers.size(); i++) {
 			aScroller = pamScrollers.get(i);
-			scrollRange = aScroller.getMaximumMillis() - aScroller.getMinimumMillis();
-			newMin = checkMinimumTime(menuMouseTime - scrollRange / 2);
-			newMax = checkMaximumTime(newMin + scrollRange);
-			newMin = newMax-scrollRange;
-			newMin = checkGapPos(dataBlock, newMin, newMax);
-			newMax = newMin + scrollRange;
-			aScroller.setRangeMillis(newMin, newMax, false);
-			//			aScroller.setValueMillis(menuMouseTime - scrollRange/2);
+			centreScrollerAt(aScroller, dataBlock, menuMouseTime);
 		}
 		loadData(false);
 	}
+	
+	/**
+	 * Moves outer scroller to centre at given time. 
+	 * @param aScroller
+	 * @param dataBlock
+	 * @param menuMouseTime
+	 */
+	private void centreScrollerAt(AbstractPamScroller aScroller, PamDataBlock dataBlock, long menuMouseTime) {
+		long scrollRange, newMax, newMin;
+		scrollRange = aScroller.getMaximumMillis() - aScroller.getMinimumMillis();
+		newMin = checkMinimumTime(menuMouseTime - scrollRange / 2);
+		newMax = checkMaximumTime(newMin + scrollRange);
+		newMin = menuMouseTime - scrollRange/2;
+		newMin = checkGapPos(dataBlock, newMin, newMax);
+		newMax = newMin + scrollRange;
+		System.out.printf("Centering scoller at %s, range %s to %s\n", PamCalendar.formatDBDateTime(menuMouseTime),
+				PamCalendar.formatDBDateTime(newMin), PamCalendar.formatDBDateTime(newMax));
+		aScroller.setRangeMillis(newMin, newMax, false);
+		aScroller.setValueMillis(menuMouseTime);
+	}
+	
+	@Override
+	public void scrollToTime(PamDataBlock dataBlock, long menuMouseTime) {
+		// centre all scroll bars as close to the above as is possible.
+		AbstractPamScroller aScroller;
+		boolean moved = false;
+		for (int i = 0; i < pamScrollers.size(); i++) {
+			aScroller = pamScrollers.get(i);
+			long scrollerMin = aScroller.getMinimumMillis();
+			long scrollerMax = aScroller.getMaximumMillis();
+			if (menuMouseTime < scrollerMin || menuMouseTime > scrollerMax) {
+				centreScrollerAt(aScroller, dataBlock, menuMouseTime);
+				moved = true;
+			}
+			aScroller.setValueMillis(menuMouseTime);
+		}
+		if (moved) {
+			loadData(false);
+		}
+	}
 
 	@Override
 	public void startDataAt(PamDataBlock dataBlock, long menuMouseTime, boolean immediateLoad) {