diff --git a/src/main/lemondronor/advisorycircular.cljs b/src/main/lemondronor/advisorycircular.cljs
index e009a54..0e8ef37 100644
--- a/src/main/lemondronor/advisorycircular.cljs
+++ b/src/main/lemondronor/advisorycircular.cljs
@@ -443,7 +443,9 @@
    :properties props
    :geometry
    {:type "LineString"
-    :coordinates (map (fn [pos] [(:lon pos) (:lat pos)]) coords)}})
+    :coordinates (map (fn [pos]
+                        [(:lon pos) (:lat pos) (util/feet-to-meters (:alt pos))])
+                      coords)}})
 
 
 (defn track->geojson [older-positions recent-positions icao centroid]
diff --git a/src/main/lemondronor/advisorycircular/adsbx.cljs b/src/main/lemondronor/advisorycircular/adsbx.cljs
index 6335fb4..0a17212 100644
--- a/src/main/lemondronor/advisorycircular/adsbx.cljs
+++ b/src/main/lemondronor/advisorycircular/adsbx.cljs
@@ -49,6 +49,16 @@
    selector))
 
 
+(defn tar1090-url [icao options]
+  (let [url (gstring/format
+             "https://tar1090.adsbexchange.com/?icao=%s&zoom=%s&noIsolation&hideButtons&hideSidebar"
+             icao
+             (or (:zoom options) 14))]
+    (if (:simple-tracks options)
+      (str url "&monochromeMarkers=ffff55&monochromeTracks=010101&outlineColor=505050")
+      url)))
+
+
 (defn screenshot-aircraft
   ([icao lat lon]
    (screenshot-aircraft icao lat lon {}))
@@ -72,7 +82,7 @@
          (if-let [user-agent (:user-agent options)]
            (.setUserAgent page user-agent))
          (log-debug "Navigating")
-         (let [url (gstring/format "https://tar1090.adsbexchange.com/?icao=%s&zoom=%s&noIsolation&hideButtons&hideSidebar&monochromeMarkers=ffff55&monochromeTracks=010101&outlineColor=505050" icao (or (:zoom options) 14))]
+         (let [url (tar1090-url icao options)]
            (log-info "Getting screenshot at url %s with zoom %s" url (or (:zoom options) 14))
            (p/all [(.waitForNavigation page)
                    (.goto page
diff --git a/src/main/lemondronor/advisorycircular/util.cljs b/src/main/lemondronor/advisorycircular/util.cljs
index d2d0b5e..3ff35fe 100644
--- a/src/main/lemondronor/advisorycircular/util.cljs
+++ b/src/main/lemondronor/advisorycircular/util.cljs
@@ -97,3 +97,7 @@
          (.getUTCMinutes date)
          (.getUTCSeconds date)
          (.getUTCMilliseconds date))))
+
+
+(defn feet-to-meters [f]
+  (* f 0.3048))