Added new sentences

src/NmeaParser/Nmea/Class/Types.cs

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+namespace NmeaParser.Nmea.Class
+{
+    /// <summary>
+    ///     Data reference in use
+    /// </summary>
+    public enum Reference
+    {
+        /// <summary>
+        ///     True
+        /// </summary>
+        True,
+
+        /// <summary>
+        ///     Relative
+        /// </summary>
+        Relative,
+
+        /// <summary>
+        ///     Magnetic
+        /// </summary>
+        Magnetic,
+
+        /// <summary>
+        ///     No data available
+        /// </summary>
+        NaN
+    }
+
+    /// <summary>
+    ///     Speed reference in use
+    /// </summary>
+    public enum SpeedReference
+    {
+        /// <summary>
+        ///     Bottom track
+        /// </summary>
+        BottomTrack,
+
+        /// <summary>
+        ///     Wather track
+        /// </summary>
+        WatherTrack,
+
+        /// <summary>
+        ///     Positioning System
+        /// </summary>
+        PosSystem,
+
+        /// <summary>
+        ///     No data available
+        /// </summary>
+        NaN
+    }
+
+    /// <summary>
+    ///     Data status
+    /// </summary>
+    public enum Validation
+    {
+        /// <summary>
+        ///     Ok
+        /// </summary>
+        Ok,
+
+        /// <summary>
+        ///     Warning
+        /// </summary>
+        Warning,
+
+        /// <summary>
+        ///     Invalid
+        /// </summary>
+        Invalid,
+
+        /// <summary>
+        ///     No data available
+        /// </summary>
+        NaN
+    }
+
+    /// <summary>
+    ///     Unit
+    /// </summary>
+    public enum Unit
+    {
+        /// <summary>
+        ///     Km/h
+        /// </summary>
+        Kmh,
+
+        /// <summary>
+        ///     Meter
+        /// </summary>
+        M,
+
+        /// <summary>
+        ///     Meters per second
+        /// </summary>
+        Msec,
+
+        /// <summary>
+        ///     Miles
+        /// </summary>
+        Mile,
+
+        /// <summary>
+        ///     Knot
+        /// </summary>
+        Knot,
+
+        /// <summary>
+        ///     Inches of mercury
+        /// </summary>
+        Inc,
+
+        /// <summary>
+        ///     Barometric pressure, bars
+        /// </summary>
+        Bar,
+
+        /// <summary>
+        ///     Air temperature, degrees C
+        /// </summary>
+        C,
+
+        /// <summary>
+        ///     Degrees
+        /// </summary>
+        Degrees,
+
+        /// <summary>
+        ///     Newtons
+        /// </summary>
+        Newtons,
+
+        /// <summary>
+        ///     Percent
+        /// </summary>
+        Percent,
+
+        /// <summary>
+        ///     No data available
+        /// </summary>
+        NaN
+    }
+
+    /// <summary>
+    ///     TransducerTypes
+    /// </summary>
+    public enum TransducerTypes
+    {
+        /// <summary>
+        ///     Angular displacement
+        /// </summary>
+        AngularDisplacement,
+
+        /// <summary>
+        ///     Temperature
+        /// </summary>
+        Temperature,
+
+        /// <summary>
+        ///     Depth
+        /// </summary>
+        Depth,
+
+        /// <summary>
+        ///     Frequency
+        /// </summary>
+        Frequency,
+
+        /// <summary>
+        ///     Humidity
+        /// </summary>
+        Humidity,
+
+        /// <summary>
+        ///     Force
+        /// </summary>
+        Force,
+
+        /// <summary>
+        ///     Pressure
+        /// </summary>
+        Pressure,
+
+        /// <summary>
+        ///     Flow
+        /// </summary>
+        Flow,
+
+        /// <summary>
+        ///     No data available
+        /// </summary>
+        NaN
+    }
+}

src/NmeaParser/Nmea/Cur.cs

@@ -0,0 +1,153 @@
+//  *******************************************************************************
+//  *  Licensed under the Apache License, Version 2.0 (the "License");
+//  *  you may not use this file except in compliance with the License.
+//  *  You may obtain a copy of the License at
+//  *
+//  *  http://www.apache.org/licenses/LICENSE-2.0
+//  *
+//  *   Unless required by applicable law or agreed to in writing, software
+//  *   distributed under the License is distributed on an "AS IS" BASIS,
+//  *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  *   See the License for the specific language governing permissions and
+//  *   limitations under the License.
+//  ******************************************************************************
+
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
+using NmeaParser.Nmea.Class;
+
+namespace NmeaParser.Messages
+{
+    /// <summary>
+    ///     Water Current Layer 
+    /// </summary>
+    /// <remarks>
+    ///     <para>
+    ///         1.: Validity of the data, A= Valid, V= not valid 
+    ///         2.:	Data set number, 0 to 9
+    ///         3.: Layer number
+    ///         4.: Current depth in meters
+    ///         5.: Current direction in degrees
+    ///         6.: Direction reference in use, True/Relative T/R
+    ///         7.:	Current Speed in Knots
+    ///         8.:	Reference layer depth in meters
+    ///         9.:	Heading
+    ///         10.:Heading reference in use, True/Magnetic T/M
+    ///         11.:Speed reference, B : Bottom track, W: Water track, P : Positioning System
+    ///     </para>
+    /// </remarks>
+    [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "StCur")]
+    [NmeaMessageType("--CUR")]
+    public class Cur : NmeaMessage
+    {
+        /// <summary>
+        ///     Initializes a new instance of the <see cref="Cur" /> class.
+        /// </summary>
+        /// <param name="type">The message type</param>
+        /// <param name="message">The NMEA message values.</param>
+        public Cur(string type, string[] message) : base(type, message)
+        {
+            if (message == null || message.Length < 9)
+                throw new ArgumentException("Invalid Cur", "message");
+
+            Validation = message[0] == "A" ? Validation.Ok : Validation.Warning;
+
+            DataSetNo = double.TryParse(message[1], NumberStyles.Float, CultureInfo.InvariantCulture, out var tmp)
+                ? tmp
+                : double.NaN;
+
+            LayerNo = double.TryParse(message[2], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp)
+                ? tmp
+                : double.NaN;
+
+            CurrentDepthMeter = double.TryParse(message[3], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp)
+                ? tmp
+                : double.NaN;
+
+            CurrentDirDeg = double.TryParse(message[4], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp)
+                ? tmp
+                : double.NaN;
+
+            DirectionRefInUse =
+                message[5] == "T" ? Reference.True : Reference.Relative;
+
+            CurrentSpeedKnots = double.TryParse(message[6], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp)
+                ? tmp
+                : double.NaN;
+
+            RefLayerDepthMeters = double.TryParse(message[7], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp)
+                ? tmp
+                : double.NaN;
+
+            Heading = double.TryParse(message[8], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp)
+                ? tmp
+                : double.NaN;
+
+            HeadingRefInUse = message[9] == "T" ? Reference.True : Reference.Magnetic;
+
+            SpeedRefInUse = message[10] switch
+            {
+                "B" => SpeedReference.BottomTrack,
+                "W" => SpeedReference.WatherTrack,
+                "P" => SpeedReference.PosSystem,
+                _ => SpeedRefInUse
+            };
+        }
+
+        /// <summary>
+        ///     Data Validation
+        /// </summary>
+        public Validation Validation { get; }
+
+        /// <summary>
+        ///     Data set number, 0 to 9
+        /// </summary>
+        public double DataSetNo { get; }
+
+        /// <summary>
+        ///     Layer number
+        /// </summary>
+        public double LayerNo { get; }
+
+        /// <summary>
+        ///     Current depth in meters
+        /// </summary>
+        public double CurrentDepthMeter { get; }
+
+        /// <summary>
+        ///     Current direction in degrees
+        /// </summary>
+        public double CurrentDirDeg { get; }
+
+        /// <summary>
+        ///     Direction reference in use, True/Relative T/R
+        /// </summary>
+        public Reference DirectionRefInUse { get; }
+
+        /// <summary>
+        ///     Range to destination in nautical miles
+        /// </summary>
+        public double CurrentSpeedKnots { get; }
+
+        /// <summary>
+        ///     Reference layer depth in meters
+        /// </summary>
+        public double RefLayerDepthMeters { get; }
+
+        /// <summary>
+        ///     Heading
+        /// </summary>
+        public double Heading { get; }
+
+        /// <summary>
+        ///     Heading reference in use, True/Magnetic T/M
+        /// </summary>
+        public Reference HeadingRefInUse { get; }
+
+        /// <summary>
+        ///     Speed reference, B : Bottom track, W: Water track, P : Positioning System
+        /// </summary>
+        public SpeedReference SpeedRefInUse { get; }
+    }
+}