diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 75a562a..1deab6b 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -15,6 +15,8 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity android:name=".PrefsAct"
+		android:label="@string/app_name" />
 	<service android:name=".AprsService">
 	    <intent-filter>
 		<action android:name="de.duenndns.aprsdroid.SERVICE" />
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 1fb8e35..a9355a8 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1,7 +1,25 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+<string name="app_name">APRSdroid</string>
+<string name="firstrun">You need to configure APRSdroid first!</string>
 <string name="singlelog">Single Shot</string>
 <string name="startlog">Start Logging</string>
-<string name="app_name">APRSdroid</string>
 <string name="stoplog">Stop Logging</string>
+<string name="p__ham">Amateur Radio</string>
+<string name="p_callsign">Callsign</string>
+<string name="p_callsign_summary">Your HAM radio callsign</string>
+<string name="p_callsign_entry">Enter your callsign</string>
+<string name="p_passcode">Passcode</string>
+<string name="p_passcode_summary">APRS-IS validation passcode</string>
+<string name="p_passcode_entry">Enter the passcode for your call</string>
+<string name="p__network">Networking</string>
+<string name="p_host">Server</string>
+<string name="p_host_summary">APRS-IS server (port 8080) to send beacons</string>
+<string name="p_host_entry">Enter the APRS-IS server hostname</string>
+<string name="p_interval">Update interval</string>
+<string name="p_interval_summary">Minutes between beacon transmissions</string>
+<string name="p_interval_entry">Enter the update interval [min]</string>
+<string name="p_distance">Update distance</string>
+<string name="p_distance_summary">Kilometers before beacon transmission</string>
+<string name="p_distance_entry">Enter the update distance [km]</string>
 </resources>
diff --git a/src/de/duenndns/aprsdroid/APRSdroid.scala b/src/de/duenndns/aprsdroid/APRSdroid.scala
index 0e84ad9..735f073 100644
--- a/src/de/duenndns/aprsdroid/APRSdroid.scala
+++ b/src/de/duenndns/aprsdroid/APRSdroid.scala
@@ -4,15 +4,19 @@ import _root_.android.app.Activity
 import _root_.android.content._
 import _root_.android.location._
 import _root_.android.os.Bundle
+import _root_.android.preference.PreferenceManager
 import _root_.android.util.Log
 import _root_.android.view.View
 import _root_.android.view.View.OnClickListener
 import _root_.android.widget.Button
 import _root_.android.widget.TextView
+import _root_.android.widget.Toast
 
 class APRSdroid extends Activity with LocationListener with OnClickListener {
 	val TAG = "APRSdroid"
 
+	lazy val prefs = PreferenceManager.getDefaultSharedPreferences(this)
+
 	lazy val lat = findViewById(R.id.lat).asInstanceOf[TextView]
 	lazy val lon = findViewById(R.id.lon).asInstanceOf[TextView]
 	lazy val status = findViewById(R.id.status).asInstanceOf[TextView]
@@ -40,6 +44,17 @@ class APRSdroid extends Activity with LocationListener with OnClickListener {
 		registerReceiver(locReceiver, new IntentFilter(AprsService.UPDATE))
 	}
 
+	override def onResume() {
+		super.onResume()
+		List("callsign", "passcode", "host").foreach { p =>
+			if (!prefs.contains(p)) {
+				startActivity(new Intent(this, classOf[PrefsAct]));
+				Toast.makeText(this, R.string.firstrun, Toast.LENGTH_SHORT).show()
+				return
+			}
+		}
+	}
+
 	override def onDestroy() {
 		super.onDestroy()
 		unregisterReceiver(locReceiver)
diff --git a/src/de/duenndns/aprsdroid/AprsService.scala b/src/de/duenndns/aprsdroid/AprsService.scala
index ff994a2..b598c9c 100644
--- a/src/de/duenndns/aprsdroid/AprsService.scala
+++ b/src/de/duenndns/aprsdroid/AprsService.scala
@@ -4,6 +4,7 @@ import _root_.android.app.Service
 import _root_.android.content.{Context, Intent}
 import _root_.android.location._
 import _root_.android.os.{Bundle, IBinder}
+import _root_.android.preference.PreferenceManager
 import _root_.android.util.Log
 import _root_.android.widget.Toast
 
@@ -18,8 +19,7 @@ class AprsService extends Service with LocationListener {
 	import AprsService._
 	val TAG = "AprsService"
 
-	val UPDATE_TIME = 10000 // 10k ms = 10s
-	val UPDATE_DIST = 10 // 10m
+	lazy val prefs = PreferenceManager.getDefaultSharedPreferences(this)
 
 	lazy val locMan = getSystemService(Context.LOCATION_SERVICE).asInstanceOf[LocationManager]
 
@@ -29,8 +29,10 @@ class AprsService extends Service with LocationListener {
 		showToast("Service started: " + i.getAction)
 		i.getAction match {
 		case SERVICE =>
+			val upd_int = prefs.getInt("interval", 10)
+			val upd_dist = prefs.getInt("distance", 10)
 			locMan.requestLocationUpdates(LocationManager.GPS_PROVIDER,
-				UPDATE_TIME, UPDATE_DIST, this)
+				upd_int * 60000, upd_dist * 1000, this)
 		case SERVICE_ONCE =>
 			stopSelf()
 		}
diff --git a/src/de/duenndns/aprsdroid/PrefsAct.scala b/src/de/duenndns/aprsdroid/PrefsAct.scala
new file mode 100644
index 0000000..9f45df0
--- /dev/null
+++ b/src/de/duenndns/aprsdroid/PrefsAct.scala
@@ -0,0 +1,11 @@
+package de.duenndns.aprsdroid
+
+import _root_.android.os.Bundle
+import _root_.android.preference.PreferenceActivity
+
+class PrefsAct extends PreferenceActivity {
+	override def onCreate(savedInstanceState: Bundle) {
+		super.onCreate(savedInstanceState)
+		addPreferencesFromResource(R.xml.preferences)
+	}
+}