Turn-By-Turn Driving Directions in Android with Mono for Android (MonoDroid)
String url = String.Format("http://maps.google.com/maps?saddr={0},{1}&daddr={2}", lat, lon, dAddr);
Intent intent = new Intent(Android.Content.Intent.ActionView, Android.Net.Uri.Parse(url));
StartActivity(intent);
In this code, I needed to get some directions from the current latitude and longitude.