var myLatlng = new google.maps.LatLng( 31.4842019,74.3135735);
              var number  =$v('P4_GPS_ARRAY') ;
        document.getElementById("myText").innerHTML = number; // here i am getting all gps as i above explained.
            var map = new google.maps.Map(document.getElementById('map'), {
              zoom: 15,
              center: {lat: 31.4842019, lng: 74.3135735},
              mapTypeId: 'terrain'
            });

            var flightPlanCoordinates = [
             $v('P4_GPS_ARRAY')  // i have to use here in variable formk
            ];
            var flightPath = new google.maps.Polyline({
              path: flightPlanCoordinates,
              geodesic: true,
              strokeColor: '#FF0000',
              strokeOpacity: 1.0,
              strokeWeight: 2,
              text: 'Route name'
            });

            flightPath.setMap(map);
    var marker = new google.maps.Marker({
        position: myLatlng,
        title:"jksdahfkjsdhfksdauhfuidshaiufhdsaiufdshui"
    });