From d5b89fef5fdbdfcbd4148a5c46bce664ee8d3585 Mon Sep 17 00:00:00 2001
From: Morten Nielsen <mn@iter.dk>
Date: Thu, 16 Jan 2020 21:48:59 -0800
Subject: [PATCH] Added RMA message

---
 src/NmeaParser/Nmea/Rma.cs | 168 +++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 src/NmeaParser/Nmea/Rma.cs

diff --git a/src/NmeaParser/Nmea/Rma.cs b/src/NmeaParser/Nmea/Rma.cs
new file mode 100644
index 0000000..b4a7b68
--- /dev/null
+++ b/src/NmeaParser/Nmea/Rma.cs
@@ -0,0 +1,168 @@
+//  *******************************************************************************
+//  *  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.Globalization;
+
+namespace NmeaParser.Nmea
+{
+    /// <summary>
+    /// Recommended minimum specific Loran-C Data
+    /// </summary>
+    /// <remarks>
+    /// <para>Position, course and speed data provided by a Loran-C receiver. Time differences A and B are those used in computing latitude/longitude.
+    /// This sentence is transmitted at intervals not exceeding 2-seconds and is always accompanied by <see cref="Rmb"/> when a destination waypoint is active.</para>
+    /// </remarks>
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Gprmb")]
+    [NmeaMessageType("--RMA")]
+    public class Rma : NmeaMessage
+    {
+        /// <summary>
+        /// Positioning system status field
+        /// </summary>
+        public enum PositioningStatus
+        {
+            /// <summary>
+            /// Data not valid
+            /// </summary>
+            Invalid = 0,
+            /// <summary>
+            /// Autonomous
+            /// </summary>
+            Autonomous,
+            /// <summary>
+            /// Differential
+            /// </summary>
+            Differential
+        }
+
+        /// <summary>
+        /// Positioning system mode indicator
+        /// </summary>
+        public enum PositioningMode
+        {
+            /// <summary>
+            /// Data not valid
+            /// </summary>
+            NotValid = 0,
+            /// <summary>
+            /// Autonomous mode
+            /// </summary>
+            Autonomous,
+            /// <summary>
+            /// Differential mode
+            /// </summary>
+            Differential,
+            /// <summary>
+            /// Estimated (dead reckoning) mode
+            /// </summary>
+            Estimated,
+            /// <summary>
+            /// Manual input mode
+            /// </summary>
+            Manual,
+            /// <summary>
+            /// Simulator mode
+            /// </summary>
+            Simulator,
+        }
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Rma"/> class.
+        /// </summary>
+        /// <param name="type">The message type</param>
+        /// <param name="message">The NMEA message values.</param>
+        public Rma(string type, string[] message) : base(type, message)
+        {
+            if (message == null || message.Length < 12)
+                throw new ArgumentException("Invalid RMA", "message");
+
+            Status = message[0] == "A" ? PositioningStatus.Autonomous : (message[0] == "D" ? PositioningStatus.Differential : PositioningStatus.Invalid);
+            Latitude = NmeaMessage.StringToLatitude(message[1], message[2]);
+            Longitude = NmeaMessage.StringToLongitude(message[3], message[4]);
+            if (double.TryParse(message[5], NumberStyles.Float, CultureInfo.InvariantCulture, out double tmp))
+                TimeDifferenceA = TimeSpan.FromMilliseconds(tmp / 1000);
+            if (double.TryParse(message[6], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp))
+                TimeDifferenceB = TimeSpan.FromMilliseconds(tmp / 1000);
+            if (double.TryParse(message[7], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp))
+                Speed = tmp;
+            else
+                Speed = double.NaN;
+            if (double.TryParse(message[8], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp))
+                Course = tmp;
+            else
+                Course = double.NaN;
+            if (double.TryParse(message[9], NumberStyles.Float, CultureInfo.InvariantCulture, out tmp))
+                MagneticVariation = tmp * (message[10] == "E" ? -1 : 1);
+            else
+                MagneticVariation = double.NaN;
+
+            switch (message[11])
+            {
+                case "A": Mode = PositioningMode.Autonomous; break;
+                case "D": Mode = PositioningMode.Autonomous; break;
+                case "E": Mode = PositioningMode.Estimated; break;
+                case "M": Mode = PositioningMode.Manual; break;
+                case "S": Mode = PositioningMode.Simulator; break;
+                case "N":
+                default:
+                    Mode = PositioningMode.Autonomous; break;
+            }
+        }
+
+        /// <summary>
+        /// Positioning system status
+        /// </summary>
+        public PositioningStatus Status { get; }
+
+        /// <summary>
+        /// Latitude
+        /// </summary>
+        public double Latitude { get; }
+
+        /// <summary>
+        /// Longitude
+        /// </summary>
+        public double Longitude { get; }
+
+        /// <summary>
+        /// Time difference A
+        /// </summary>
+        public TimeSpan TimeDifferenceA { get; }
+
+        /// <summary>
+        /// Time difference B
+        /// </summary>
+        public TimeSpan TimeDifferenceB { get; }
+
+        /// <summary>
+        /// Speed over ground in knots.
+        /// </summary>
+        public double Speed { get; }
+
+        /// <summary>
+        /// Course over ground in degrees from true north
+        /// </summary>
+        public double Course { get; }
+
+        /// <summary>
+        /// Magnetic variation in degrees.
+        /// </summary>
+        public double MagneticVariation { get; }
+
+        /// <summary>
+        /// Positioning system mode indicator
+        /// </summary>
+        public PositioningMode Mode { get; }
+    }
+}