# Creating a location provider for ArcGIS Runtime SDK

Below is an implementation for use with the [ArcGIS Runtime SDK for .NET](http://developers.arcgis.com/net). Use this location provider on the MapView's LocationDisplay to send it location data from your NMEA device to display your current location on a map.

Below is an example implementation of this.
You can also check out the Desktop Sample app in the [Github Repo]( https://github.com/dotMorten/NmeaParser/blob/master/src/SampleApp.WinDesktop/NmeaProvider.cs) which uses this to display a map.

**Usage:**
```csharp
NmeaParser.NmeaDevice device = new NmeaParser.NmeaFileDevice("NmeaSampleData.txt");
mapView.LocationDisplay.LocationProvider = new NmeaLocationProvider(device);
mapView.LocationDisplay.IsEnabled = true;
```

**NmeaLocationProvider.cs**
```csharp
using System;
using System.Threading.Tasks;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Location;

namespace NmeaParser.ArcGIS
{
    public class NmeaLocationProvider : ILocationProvider
    {
        public event EventHandler<LocationInfo> LocationChanged;
        private readonly NmeaParser.NmeaDevice device;

        public NmeaLocationProvider(NmeaParser.NmeaDevice device)
        {
            this.device = device;
            device.MessageReceived += device_MessageReceived;
        }

        void device_MessageReceived(object sender, NmeaParser.NmeaMessageReceivedEventArgs e)
        {
            var message = e.Message;
            if (message is NmeaParser.Messages.Rmc rmc && rmc.Active)
            {
                LocationChanged?.Invoke(this, new LocationInfo()
                {
                    Course = rmc.Course,
                    Speed = rmc.Speed,
                    Location = new MapPoint(rmc.Longitude, rmc.Latitude, SpatialReferences.Wgs84)
                });
            }
        }

        public Task StartAsync() => device.OpenAsync();

        public Task StopAsync() => device.CloseAsync();
    }
}

```

![Screenshot](https://user-images.githubusercontent.com/1378165/73328707-95990e80-420f-11ea-85a7-43149e29bd21.png)