########### C# file
using Esri.ArcGISRuntime;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Location;
using Esri.ArcGISRuntime.Xamarin.Forms.UI;
using System;
using Xamarin.Forms;

namespace FieldEngineerLite.Views
{
	public partial class TestGIS : ContentPage
	{

        public TestGIS()
        {
            InitializeComponent();

            Title = "Test GPS";
            // Create the UI, setup the control references and execute initialization
            Initialize();
        }

        private async void Initialize()
        {
            // Create new Map with basemap
            var myMap = new Map(Basemap.CreateTopographic());

            // Create envelope to be used as a target extent for map's initial viewpoint
            Envelope myEnvelope = new Envelope(
                -14260091.99687875, 2807349.5830308953,-7352630.624805781,6500786.789769631,
                SpatialReferences.WebMercator);

            // Set the initial viewpoint for map
            myMap.InitialViewpoint = new Viewpoint(myEnvelope);

            // Provide used Map to the MapView
            MyMapView.Map = myMap;

            //get location
            MyMapView.LocationDisplay.AutoPanMode = LocationDisplayAutoPanMode.Default;
            MyMapView.LocationDisplay.Start();

        }
    }
}


#############XAML File
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Xamarin.Forms.UI;assembly=Esri.ArcGISRuntime.Xamarin.Forms"
             xmlns:mapping="clr-namespace:Esri.ArcGISRuntime.Mapping;assembly=Esri.ArcGISRuntime"
             xmlns:location="clr-namespace:Esri.ArcGISRuntime.Location;assembly=Esri.ArcGISRuntime"
             x:Class="FieldEngineerLite.Views.TestGIS">
  <Grid>
    <esriUI:MapView x:Name="MyMapView">
      <location:LocationDisplay
                AutoPanMode="Navigation"
                DefaultSymbol="{StaticResource NotMovingMarkerSym}" CourseSymbol="{StaticResource MovingMarkerSym}"
                IsEnabled="True" IsPingAnimationEnabled="True">
      </location:LocationDisplay>
    </esriUI:MapView>
  </Grid>
</ContentPage>