diff --git a/app/src/main/java/com/rtbishop/lookingsat/MainViewModel.kt b/app/src/main/java/com/rtbishop/lookingsat/MainViewModel.kt
index a8bca96f..3628292b 100644
--- a/app/src/main/java/com/rtbishop/lookingsat/MainViewModel.kt
+++ b/app/src/main/java/com/rtbishop/lookingsat/MainViewModel.kt
@@ -32,11 +32,13 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     private val defValueLoc = application.getString(R.string.def_gsp_loc)
     private val defValueHours = application.getString(R.string.def_hours_ahead)
     private val defValueMinEl = application.getString(R.string.def_min_el)
+    private val defValueUpdateFreq = application.getString(R.string.def_update_freq)
     private val keyLat = application.getString(R.string.key_lat)
     private val keyLon = application.getString(R.string.key_lon)
     private val keyAlt = application.getString(R.string.key_alt)
     private val keyHours = application.getString(R.string.key_hours_ahead)
     private val keyMinEl = application.getString(R.string.key_min_el)
+    private val keyUpdateFreq = application.getString(R.string.key_update_freq)
     private val tleMainListFileName = application.getString(R.string.tle_main_list_file_name)
     private val tleSelectionFileName = application.getString(R.string.tle_selection_file_name)
     private val app = application
@@ -67,6 +69,8 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     var satPassList = emptyList<SatPass>()
     var tleMainList = loadTwoLineElementFile()
     var selectionList = loadSelectionList()
+    val updateFreq
+        get() = preferences.getString(keyUpdateFreq, defValueUpdateFreq)!!.toLong()
 
     fun updateGsp() {
         val lat = preferences.getString(keyLat, defValueLoc)!!.toDouble()
diff --git a/app/src/main/java/com/rtbishop/lookingsat/ui/RadarFragment.kt b/app/src/main/java/com/rtbishop/lookingsat/ui/RadarFragment.kt
index 633682ab..e43fe56d 100644
--- a/app/src/main/java/com/rtbishop/lookingsat/ui/RadarFragment.kt
+++ b/app/src/main/java/com/rtbishop/lookingsat/ui/RadarFragment.kt
@@ -26,7 +26,6 @@ import kotlin.math.sin
 
 class RadarFragment : Fragment() {
 
-    private val delay = 2000L
     private val service = Executors.newSingleThreadScheduledExecutor()
 
     private lateinit var viewModel: MainViewModel
@@ -57,6 +56,7 @@ class RadarFragment : Fragment() {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+        val delay = viewModel.updateFreq
         satPass = arguments?.get("satPass") as SatPass
         mainActivity = activity as MainActivity
         mainActivity.supportActionBar?.title = satPass.tle.name
@@ -69,7 +69,7 @@ class RadarFragment : Fragment() {
         radarAltitude = view.findViewById(R.id.radar_altitude)
         transNoFound = view.findViewById(R.id.radar_no_trans)
 
-        radarView = RadarView(mainActivity)
+        radarView = RadarView(mainActivity, delay)
         radarSkyFrame.addView(radarView)
         service.scheduleAtFixedRate({ radarView.invalidate() }, 0, delay, TimeUnit.MILLISECONDS)
 
@@ -94,7 +94,7 @@ class RadarFragment : Fragment() {
         }
     }
 
-    inner class RadarView(context: Context) : View(context) {
+    inner class RadarView(context: Context, updateFreq: Long) : View(context) {
 
         private val radarSize = resources.displayMetrics.widthPixels
         private val scale = resources.displayMetrics.density
@@ -104,6 +104,7 @@ class RadarFragment : Fragment() {
         private val piDiv2 = Math.PI / 2.0
         private val txtSize = scale * 15
         private val center = 0f
+        private val delay = updateFreq
 
         private val bmp: Bitmap = Bitmap.createBitmap(radarSize, radarSize, Bitmap.Config.ARGB_8888)
         private val mtrx: Matrix = Matrix().apply {
diff --git a/app/src/main/java/com/rtbishop/lookingsat/ui/WorldMapFragment.kt b/app/src/main/java/com/rtbishop/lookingsat/ui/WorldMapFragment.kt
index 35e75c3f..5538bac3 100644
--- a/app/src/main/java/com/rtbishop/lookingsat/ui/WorldMapFragment.kt
+++ b/app/src/main/java/com/rtbishop/lookingsat/ui/WorldMapFragment.kt
@@ -26,7 +26,6 @@ import kotlin.math.roundToInt
 
 class WorldMapFragment : Fragment() {
 
-    private val delay = 3000L
     private val service = Executors.newSingleThreadScheduledExecutor()
 
     private lateinit var viewModel: MainViewModel
@@ -55,6 +54,7 @@ class WorldMapFragment : Fragment() {
 //        fab = view.findViewById(R.id.worldmap_fab)
 //        fab.setOnClickListener { showSelectSatDialog() }
 
+        val delay = viewModel.updateFreq
         val tleString = arrayOf(
             "METEOR-M2 2",
             "1 44387U 19038A   19336.45319619 -.00000025  00000-0  80323-5 0  9996",
@@ -71,8 +71,7 @@ class WorldMapFragment : Fragment() {
 
         trackView = TrackView(activity as MainActivity)
         mapFrame.addView(trackView)
-
-        service.scheduleAtFixedRate({ trackView.invalidate() }, delay, delay, TimeUnit.MILLISECONDS)
+        service.scheduleAtFixedRate({ trackView.invalidate() }, 0, delay, TimeUnit.MILLISECONDS)
     }
 
 //    private fun showSelectSatDialog() {