Add project files.

NmeaMessages/GpvtgMessage.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GpsClient2.NmeaMessages {
+    public class GpvtgMessage : NmeaMessage {
+        #region Description
+
+        //      $GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*48
+
+        //      where:
+        //          VTG Track made good and ground speed
+        //          054.7,T True track made good(degrees)
+        //          034.4,M Magnetic track made good
+        //          005.5,N Ground speed, knots
+        //          010.2,K Ground speed, Kilometers per hour
+        //          *48          Checksum
+
+        #endregion
+
+        #region Properties
+
+        /// <summary>
+        /// True track made good(degrees)
+        /// </summary>
+        public float TrackDegrees { get; set; }
+
+        /// <summary>
+        /// Magnetic track made good
+        /// </summary>
+        public float MagneticTrack { get; set; }
+
+        /// <summary>
+        /// Ground speed, knots
+        /// </summary>
+        public float GroundSpeetKnots { get; set; }
+
+        /// <summary>
+        /// Ground speed, Kilometers per hour
+        /// </summary>
+        public float GroundSpeed { get; set; }
+
+        #endregion
+
+        #region Message parsing
+
+        public override void Parse(string[] messageParts) {
+            //$GPVTG,054.7,T,034.4,M,005.5,N,010.2,K * 48
+            if (messageParts == null || messageParts.Length < 9) {
+                throw new ArgumentException("Invalid GPVTG message");
+            }
+            TrackDegrees = messageParts[1].ToFloat();
+            MagneticTrack = messageParts[3].ToFloat();
+            GroundSpeetKnots = messageParts[5].ToFloat();
+            GroundSpeed = messageParts[7].ToFloat();
+        }
+
+        #endregion
+
+        public override string ToString() {
+            return $"Speed {GroundSpeed} - Track level {TrackDegrees}";
+        }
+    }
+}