Index: patched/gmap/gmap_taxonomy.module
===================================================================
--- patched/gmap/gmap_taxonomy.module	(revision 460)
+++ patched/gmap/gmap_taxonomy.module	(working copy)
@@ -132,17 +132,33 @@
       if (isset($node->taxonomy) && is_array($node->taxonomy)) {
         foreach ($node->taxonomy as $voc => $terms) {
           if (isset($status[$voc]) && $status[$voc]) {
-            $t = $terms;
-            if (!is_array($t)) {
-              $t = array($t);
-            }
-            foreach ($t as $term) {
-              $result = db_query('SELECT marker, tid FROM {gmap_taxonomy_term} WHERE tid = %d', $term);
+            // if this node has a primary term, use that as the marker.
+            // this allows using a vocabulary which allows multiple terms.
+            if (!empty($node->primary_term) || !empty($node->primaryterm)) {
+              if (!empty($node->primaryterm)) {
+                $markertid = $node->primaryterm;
+              }
+              elseif (!empty($node->primary_term)) {
+                $markertid = $node->primary_term->tid;
+              }
+              $result = db_query('SELECT marker, tid FROM {gmap_taxonomy_term} WHERE tid = %d', $markertid);
               if ($m = db_fetch_object($result)) {
                 $marker = $m->marker;
-                $markertid = $m->tid;
               }
             }
+            else {
+              $t = $terms;
+              if (!is_array($t)) {
+                $t = array($t);
+              }
+              foreach ($t as $term) {
+                $result = db_query('SELECT marker, tid FROM {gmap_taxonomy_term} WHERE tid = %d', $term);
+                if ($m = db_fetch_object($result)) {
+                  $marker = $m->marker;
+                  $markertid = $m->tid;
+                }
+              }
+            }
           }
         }
         if (!empty($marker)) {