/// <summary>
 /// Calculates bearing between start and stop.
 /// </summary>
 /// <param name="start">Start coordinates.</param>
 /// <param name="stop">Stop coordinates.</param>
 /// <returns>The <see cref="System.Double" />.</returns>
 public static double BearingFrom(this Position start, Position stop)
 {
     var deltaLon = stop.Longitude - start.Longitude;
     var cosStop = Math.Cos(stop.Latitude);
     return Math.Atan2(
         (Math.Cos(start.Latitude) * Math.Sin(stop.Latitude)) -
         (Math.Sin(start.Latitude) * cosStop * Math.Cos(deltaLon)),
         Math.Sin(deltaLon) * cosStop);
 }
        /// <summary>
        /// Calculates distance between two locations.
        /// </summary>
        /// <param name="a">Location a</param>
        /// <param name="b">Location b</param>
        /// <returns>The <see cref="System.Double" />The distance in meters</returns>
        public static double DistanceFrom(this Position a, Position b)
        {
            /*
            double distance = Math.Acos(
                (Math.Sin(a.Latitude) * Math.Sin(b.Latitude)) +
                (Math.Cos(a.Latitude) * Math.Cos(b.Latitude))
                * Math.Cos(b.Longitude - a.Longitude));
             * */

            var dLat = b.Latitude.DegreesToRadians() - a.Latitude.DegreesToRadians();
            var dLon = b.Longitude.DegreesToRadians() - a.Longitude.DegreesToRadians();

            var a1 = Math.Sin(dLat / 2) * Math.Sin(dLat / 2) + Math.Cos(a.Latitude.DegreesToRadians()) * Math.Cos(b.Latitude.DegreesToRadians()) * Math.Sin(dLon / 2) * Math.Sin(dLon / 2);
            var distance = 2 * Math.Atan2(Math.Sqrt(a1), Math.Sqrt(1 - a1));

            return EquatorRadius * distance;
        }
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        /// <summary>
        /// Initializes a new instance of the <see cref="Position" /> class.
        /// </summary>
        /// <param name="position">The position.</param>
        /// <exception cref="System.ArgumentNullException">position</exception>
        public Position(Position position)
        {
            if (position == null)
            {
                throw new ArgumentNullException("position");
            }

            Timestamp = position.Timestamp;
            Latitude = position.Latitude;
            Longitude = position.Longitude;
            Altitude = position.Altitude;
            AltitudeAccuracy = position.AltitudeAccuracy;
            Accuracy = position.Accuracy;
            Heading = position.Heading;
            Speed = position.Speed;
        }
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        /// <summary>
        /// Initializes a new instance of the <see cref="PositionEventArgs"/> class.
        /// </summary>
        /// <param name="position">The position.</param>
        /// <exception cref="System.ArgumentNullException">position</exception>
        public PositionEventArgs(Position position)
        {
            if (position == null)
            {
                throw new ArgumentNullException("position");
            }

            Position = position;
        }