diff --git a/handbook/survey/coord.htm b/handbook/survey/coord.htm
index 693fc343a..1909ba27f 100644
--- a/handbook/survey/coord.htm
+++ b/handbook/survey/coord.htm
@@ -32,7 +32,8 @@ more appropriate for a full course in geodesy, I'll try to summarise the most
 important bits as far as they are relevant to us and as far as I understand
 them myself.
 </p>
-
+ <figure class="onright">
+  <a href='/handbook/survey/l/orthoheight.html'><img width=25% src='/handbook/survey/i/orthoheight.jpg' /></a><figcaption style="text-align: left">Click for explanation</figcaption></figure>
 <h2>Projections</h2>
 
 <p>