title: React Native Maps - Smooth Movement of Marker from one coordinate to another
body: <p>I am making an tracking app with RN 0.50.1, and using react-native-maps for showing user location on maps with custom image on MapView.Marker "image" props.</p>
  
  <p>The location works fine, also the tracking works fine but the problem is the marker jumps from one co-ordinate to another on lat long change.
  Have tried setting the state with MapView.AnimatedRegion and update the coordinates using timing method, but no luck.
  Also have used <a href="https://github.com/airbnb/react-native-maps/blob/master/example/examples/AnimatedMarkers.js" rel="nofollow noreferrer">https://github.com/airbnb/react-native-maps/blob/master/example/examples/AnimatedMarkers.js</a> example but still no luck which explains to use Animated.Region, but it gives me error of Animated.Region is not a constructor.</p>
  
  <p>I need a smooth movement of marker on lat long change.</p>
  
  <p>My Package.JSON file -</p>
  
  <pre><code>{
  "name": "XXXX",
  "version": "0.0.1",
  "private": true,
  "scripts": {
      "start": "node node_modules/react-native/local-cli/cli.js start",
      "test": "jest"
  },
  "dependencies": {
      "firebase": "^4.6.1",
      "lottie-react-native": "^2.2.7",
      "moment": "^2.19.1",
      "react": "^16.0.0",
      "react-native": "0.50.1",
      "react-native-android-permissions": "^1.0.0",
      "react-native-code-push": "^5.1.3-beta",
      "react-native-maps": "^0.17.1",
      "react-native-responsive-dimensions": "^1.0.1",
      "react-native-router-flux": "^4.0.0-beta.22",
      "react-native-simple-toast": "0.0.7",
      "react-native-vector-icons": "^4.4.2"
  },
  "devDependencies": {
      "babel-jest": "21.2.0",
      "babel-preset-react-native": "4.0.0",
      "jest": "21.2.1",
      "react-test-renderer": "16.0.0"
  },
  "jest": {
      "preset": "react-native"
  }
  </code></pre>
  
  <p>}</p>
  
  <p>Any help appreciated. Please.</p>