diff --git a/src/main/lemondronor/advisorycircular.cljs b/src/main/lemondronor/advisorycircular.cljs
index 00c253b..4c12438 100644
--- a/src/main/lemondronor/advisorycircular.cljs
+++ b/src/main/lemondronor/advisorycircular.cljs
@@ -304,7 +304,14 @@
           airports (nearby-airports config lat lon {:radius (+ (:radius-km config)
                                                                (:minimum-airport-distance-km config))})]
     {:type "FeatureCollection"
-     :features (map airport->feature airports)}))
+     :features (conj
+                (map airport->feature airports)
+                {:type "Feature"
+                 :properties {:shape "Circle"
+                              :radius (* 1000 (:radius-km config))
+                              :name "Center"}
+                 :geometry {:type "Point"
+                            :coordinates [(:lon config) (:lat config)]}})}))
 
 
 (defn log-table [table keys]