Simple Polylines

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>

CSS

/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */
#map {
  height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

JavaScript

// This example creates a 2-pixel-wide red polyline showing the path of William
// Kingsford Smith's first trans-Pacific flight between Oakland, CA, and
// Brisbane, Australia.

function initMap() {  

  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 6,
    center: {
      lat: 28.5375392,
      lng: -78.3190407
    },
    mapTypeId: 'satellite'
  });

  $.getJSON("https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20json%20where%20url%3D%22https%3A%2F%2Fwww.marinetraffic.com%2Fen%2Fais%2Fget_info_window_json%3Fasset_type%3Dship%26id%3D434560%22&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys", function(d) {
    var ship = new google.maps.Marker({
      position: {
        lat: parseFloat(d.query.results.json.values.ship_lat),
        lng: parseFloat(d.query.results.json.values.ship_lon)
      },
      map: map,
      title: d.query.results.json.values.shipname
    });
  });
  $.getJSON("https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20json%20where%20url%3D%22https%3A%2F%2Fwww.marinetraffic.com%2Fen%2Fais%2Fget_info_window_json%3Fasset_type%3Dship%26id%3D426008%22&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys", function(d) {
    var ship = new google.maps.Marker({
      position: {
        lat: parseFloat(d.query.results.json.values.ship_lat),
        lng: parseFloat(d.query.results.json.values.ship_lon)
      },
      map: map,
      title: d.query.results.json.values.shipname
    });
  });
}