plumbing in the QMs page a bit more thoroughly

handbook/survey/drawup.htm

@@ -27,9 +27,10 @@ draw only what was recorded faithfully in the cave. If this makes your
 drawing look bad - record more next time! If things really are unclear,
 consider taking a copy of this drawing back into the cave to clarify it.</p>
 
-<p>Drawing a cave is not easy but anyone can learn to do it. 
-Read the brief <a href="XI-2-11.pdf">Cave Mapping - Sketching the Detail"</a> 
-5-page llustrated guide by Ken Grimes which makes everything clear.
+<h3>Preparing input into to Tunnel or Therion</h3>
+[to be written] - See <a href="newcave.html#therion">
+drawing around the centre-line</a> 
+<p>The actual published cave-survey is produced by software these days.
 
 <p>Make sure the drawing clearly shows the point of connection to previous
 surveys (look at the relevant drawing in the old survey book to ensure the
@@ -39,6 +40,13 @@ of any new question marks, with an estimate of quality and any difficulties
 which will be encountered (eg. if it is a climb, are bolts going to be
 needed ? If a dig, is it a few loose boulders or a crawl over mud?)</p>
 
+<h3>Archaic: hand-drawing the final survey</h3>
+
+<p>Drawing a cave entirely by hand is not easy but anyone can learn to do it. 
+Read the brief <a href="XI-2-11.pdf">Cave Mapping - Sketching the Detail"</a> 
+5-page llustrated guide by Ken Grimes which makes everything clear. For preliminary exploration (Grade 1 surveys) this is still appropriate.
+
+
 <p>CUCC use a set of symbols pretty close to the standard ones promulgated
 by the BCRA, with occasional differences - such as large-enough boulders
 which are sketched to scale using the US symbol. The current state of