Index: /trunk/BNC/src/bnchelp.html
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--- /trunk/BNC/src/bnchelp.html	(revision 4638)
+++ /trunk/BNC/src/bnchelp.html	(revision 4639)
@@ -60,5 +60,5 @@
 Andre Hauschild, German Space Operations Center, DLR, revised the RTCM Version 2 decoder.<br>
 Zdenek Lukes, Czech Technical University Prague, Department of Geodesy, extended the RTCM Version 2 decoder to handle message types 3, 20, 21, and 22 and added loss of lock indicator.<br>
-Jan Dousa, Geodetic Observatory Pecny, Czech Republic, provided a tool for drawing stream distribution maps and also helped with fixing bugs.<br>
+Jan Dousa, Geodetic Observatory Pecny, Czech Republic, helped with fixing bugs.<br>
 Denis Laurichesse, Centre National d'Etudes Spatiales (CNES), suggested synchronizing observations and clock corrections to reduce high frequency noise in PPP solutions.
 </p>
@@ -2300,5 +2300,7 @@
 <p><a name="map"><h4>3.18.1.6 Map - optional</h4></p>
 <p>
-Button 'Map' opens a window to show a distribution map of the caster's streams. You may like to zoom in or out using option 'Zoom +' or 'Zoom -'. You may also like to 'Clean' or 'Reset' a map or let it 'Fit' exactly to the current size of the window. Option 'Close' shuts the window.
+Button 'Map' opens a window to show a distribution map of the caster's
+streams. You may like to zoom in or out using mouse (left button: draw a
+rectangle to zoom, right button: zoom out, middle button: zoom back)
 </p>
 <p><img src="IMG/screenshot24.png"/></p>