diff --git a/README.md b/README.md
index 32561d0..eb02806 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ The bot will consider an aircraft to be "circling" if:
    300 feet or more.
 
 5. If an aircraft was previously circling, it must be considered
-   not-circling for at least 20 minutes before it is again eligible to
+   not-circling for at least 30 minutes before it is again eligible to
    be considered circling.
 
 There are a lot of weird flight paths that can meet criterion #1, and
diff --git a/src/main/lemondronor/circlebot.cljs b/src/main/lemondronor/circlebot.cljs
index 0e2bdd6..808fc91 100644
--- a/src/main/lemondronor/circlebot.cljs
+++ b/src/main/lemondronor/circlebot.cljs
@@ -112,7 +112,7 @@
         pruned-db (reduce-kv (fn [m k v]
                                (if (or (> (count (:history v)) 0)
                                        (if-let [ended-circling-time (:ended-circling-time v)]
-                                         (< (- now ended-circling-time) (* 20 60 1000))))
+                                         (< (- now ended-circling-time) (* 30 60 1000))))
                                  (assoc m k v)
                                  m))
                              {}
@@ -207,7 +207,7 @@
           (and currently-circling?
                (not previously-circling?)
                (or (nil? (:ended-circling-time ac))
-                   (> (- now (:ended-circling-time ac)) (* 20 60 1000))))
+                   (> (- now (:ended-circling-time ac)) (* 30 60 1000))))
           (let [new-ac (assoc ac :started-circling-time now)]
             (recur (rest old-db)
                    (assoc new-db icao new-ac)
@@ -320,12 +320,12 @@
 
 ;; If the centroid of the aircraft's positions is less than this close
 ;; to an airport, then it's probably just doinf flight training.
-(def minimum-airport-distance-miles 2.5)
+(def minimum-airport-distance-km 2.5)
 ;;(def minimum-airport-distance-miles 0)
 
 (defn process-potential-circle [ac config now]
   (p/let [icao (:icao ac)
-          centroid (geo/centroid (filter #(< (- now (:time %)) (* 3 60 1000)) (:history ac)))
+          centroid (geo/centroid (filter #(< (- now (:time %)) (* 6 60 1000)) (:history ac)))
           lat (:lat centroid)
           lon (:lon centroid)
           airport (closest-airport lat lon)
@@ -335,11 +335,11 @@
       (log-info "%s: Closest airport is %s, distance: %s"
                 (:icao ac) (:label airport-properties) (:distance airport-properties))
       (log-info "%s: No airports nearby" (:icao ac)))
-    (if (and airport-properties (<= (:distance airport-properties) minimum-airport-distance-miles))
-      (log-info "%s: Filtering out because it's %s miles (minimum is %s) from %s"
+    (if (and airport-properties (<= (:distance airport-properties) minimum-airport-distance-km))
+      (log-info "%s: Filtering out because it's %s km (minimum is %s) from %s"
                 (:icao ac)
                 (:distance airport-properties)
-                minimum-airport-distance-miles
+                minimum-airport-distance-km
                 (:label airport-properties)
                 ())
       (do
@@ -360,8 +360,10 @@
                                      wiki-nearby (filter feature-has-wikipedia-page? nearby)]
                                (log-info "%s: Nearby geo search: %s potential landmarks, %s with wikipedia pages"
                                          icao (count nearby) (count wiki-nearby))
+                               (doseq [l (take 3 nearby)]
+                                 (log-info "%s:   Landmark: %s") (:properties l))
                                (doseq [f wiki-nearby]
-                                 (log-info "%s:   %s %s"
+                                 (log-info "%s:   Wiki landmark: %s %s"
                                            icao
                                            (get-in f [:properties :label] f)
                                            (get-in f [:properties :addendum] f)))