Index: /trunk/BNC/src/bnchelp.html
===================================================================
--- /trunk/BNC/src/bnchelp.html	(revision 5343)
+++ /trunk/BNC/src/bnchelp.html	(revision 5344)
@@ -2119,4 +2119,5 @@
 <li>SIRGAS2000 which stands for the Geodetic Datum adopted for Brazil, and</li>
 <li>SIRGAS95 which stands for the Geodetic Datum adopted i.e. for Venezuela, and</li>
+<li>DREF91 which stands for the Geodetic Datum adopted for Germany, and</li>
 <li>'Custom' which allows a transformation of Broadcast Corrections from the IGS08 system to any other system through specifying up to 14 Helmert Transformation Parameters.</li>
 </ul>
@@ -2252,4 +2253,27 @@
 Scale rate: -0.000000000000 /y
 To: 1995.4
+</pre>
+</p>
+
+<p>
+<u>DREF91:</u> The formulas for the transformation 'ITRF2008-&gt;DREF91' are provided by Peter Franke, BKG. The following 14 Helmert Transformation Parameters were introduced:
+</p>
+<p>
+<pre>
+Translation in X at epoch To: -0.0118 m
+Translation in Y at epoch To:  0.1432 m
+Translation in Z at epoch To: -0.1117 m
+Translation rate in X:  0.0001 m/y
+Translation rate in Y:  0.0001 m/y
+Translation rate in Z: -0.0018 m/y
+Rotation in X at epoch To:   3.291 mas
+Rotation in Y at epoch To:   6.190 mas
+Rotation in Z at epoch To: -11.012 mas
+Rotation rate in X:  0.081 mas/y 
+Rotation rate in Y:  0.490 mas/y
+Rotation rate in Z: -0.792 mas/y
+Scale at epoch To : 0.00000001224
+Scale rate: 0.00000000008 /y
+To: 2000.0
 </pre>
 </p>