diff --git a/mobile/src/com/cradle/iitc_mobile/IITC_TileManager.java b/mobile/src/com/cradle/iitc_mobile/IITC_TileManager.java
index 7acf1ee3..0dd424f0 100644
--- a/mobile/src/com/cradle/iitc_mobile/IITC_TileManager.java
+++ b/mobile/src/com/cradle/iitc_mobile/IITC_TileManager.java
@@ -12,6 +12,7 @@ import java.io.FileOutputStream;
 import java.io.InputStream;
 import java.net.URL;
 import java.net.URLConnection;
+import java.util.Date;
 
 public class IITC_TileManager {
 
@@ -24,7 +25,6 @@ public class IITC_TileManager {
     }
 
     public WebResourceResponse getTile(String url) throws Exception {
-        Log.d("iitcm", "checking for tile: " + url);
         String path = mIitc.getApplication().getFilesDir().toString() + "/" + url;
         path = path.replace("http://", "");
         path = path.replace("https://", "");
@@ -33,6 +33,9 @@ public class IITC_TileManager {
         path = path.replace(fileName, "");
         File file = new File(path, fileName);
         if (file.exists()) {
+            // asynchronously download tile if outdated, ignore date if not connected to wifi
+            if (mIitc.getWebView().isConnectedToWifi()) new DownloadTile(path, fileName).execute(url);
+            // return tile from storage
             InputStream in = new BufferedInputStream(new FileInputStream(file));
             return new WebResourceResponse(TYPE, ENCODING, in);
         } else {
diff --git a/mobile/src/com/cradle/iitc_mobile/IITC_WebView.java b/mobile/src/com/cradle/iitc_mobile/IITC_WebView.java
index 23ceb645..4d74b4ae 100644
--- a/mobile/src/com/cradle/iitc_mobile/IITC_WebView.java
+++ b/mobile/src/com/cradle/iitc_mobile/IITC_WebView.java
@@ -237,7 +237,7 @@ public class IITC_WebView extends WebView {
     }
 
     @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
-    private boolean isConnectedToWifi() {
+    public boolean isConnectedToWifi() {
         ConnectivityManager conMan = (ConnectivityManager) getContext()
                 .getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkInfo wifi = conMan.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
diff --git a/mobile/src/com/cradle/iitc_mobile/async/DownloadTile.java b/mobile/src/com/cradle/iitc_mobile/async/DownloadTile.java
index 942e2e47..47eb13d6 100644
--- a/mobile/src/com/cradle/iitc_mobile/async/DownloadTile.java
+++ b/mobile/src/com/cradle/iitc_mobile/async/DownloadTile.java
@@ -37,9 +37,11 @@ public class DownloadTile extends AsyncTask<String, Void, Boolean> {
         try {
             tileUrl = new URL(urls[0]);
             conn = tileUrl.openConnection();
+            File file = new File(mFilePath, mFileName);
+            // update tile if needed, else return
+            if (conn.getLastModified() < file.lastModified()) return true;
             InputStream is = null;
             is = conn.getInputStream();
-            File file = new File(mFilePath, mFileName);
             Log.d("iitcm", "writing to file: " + file.toString());
             File output = writeTileToFile(is, file, mFilePath);
         } catch (IOException e) {