From b79651cc4baee734e5f7657ef3232d68012916a4 Mon Sep 17 00:00:00 2001
From: Joachim Spange <joachim.spange@kd.kongsberg.com>
Date: Tue, 28 Jan 2025 12:35:34 +0100
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20DPT?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/NmeaParser/Nmea/Dpt.cs                    | 71 +++++++++++++++++++
 .../NmeaParser.Tests/NmeaMessages.cs          | 12 ++++
 2 files changed, 83 insertions(+)
 create mode 100644 src/NmeaParser/Nmea/Dpt.cs

diff --git a/src/NmeaParser/Nmea/Dpt.cs b/src/NmeaParser/Nmea/Dpt.cs
new file mode 100644
index 0000000..0028611
--- /dev/null
+++ b/src/NmeaParser/Nmea/Dpt.cs
@@ -0,0 +1,71 @@
+//  *******************************************************************************
+//  *  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.Messages
+{
+    /// <summary>
+    ///     Water depth relative to the transducer, the depth offset of the transducer, and maximum depth that the sounder can detect a sea-bed (all in metres only).
+    ///     Positive offsets provide distance from the transducer to the water line. Negative offsets provide distance from the transducer to the keel.
+    ///     Not all NMEA 0183 devices that output this sentence can have their depth offset changed. In this case, the depth offset will always be zero, or not included.
+    ///     NMEA 0183 v2.0 sentences will not include the maximum depth range value at all, as it was added in v3.0.
+    /// </summary>
+    /// <remarks>
+    ///     <para>
+    ///         Format: $xxDPT,DATA_METRES,OFFSET_METRES, MAXIMUM_METRES*hh
+    ///         1.: Data
+    ///         2.: Offset
+    ///         3.: Maximum
+    ///     </para>
+    ///     <para>
+    ///         Depth
+    ///     </para>
+    /// </remarks>
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "SdDpt")]
+    [NmeaMessageType("--DPT")]
+    public class Dpt : NmeaMessage
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Dpt"/> class.
+        /// </summary>
+        /// <param name="type">The message type</param>
+        /// <param name="message">The NMEA message values.</param>
+        public Dpt(string type, string[] message) : base(type, message)
+        {
+            if (message == null || message.Length < 3)
+                throw new ArgumentException("Invalid Dpt", "message");
+
+            DepthMeters = double.Parse(message[0], CultureInfo.InvariantCulture);
+            DepthOffsetMeters = double.Parse(message[1], CultureInfo.InvariantCulture);
+            MaxDepthRangeMeters = double.Parse(message[2], CultureInfo.InvariantCulture);
+        }
+
+        /// <summary>
+        ///     Depth, in meters
+        /// </summary>
+        public double DepthMeters { get; }
+
+        /// <summary>
+        ///     Depth offset, in meters
+        /// </summary>
+        public double DepthOffsetMeters { get; }
+
+        /// <summary>
+        ///     Maximum depth range, in meters
+        /// </summary>
+        public double MaxDepthRangeMeters { get; }
+    }
+}
\ No newline at end of file
diff --git a/src/UnitTests/NmeaParser.Tests/NmeaMessages.cs b/src/UnitTests/NmeaParser.Tests/NmeaMessages.cs
index 1467fa6..3d58f9e 100644
--- a/src/UnitTests/NmeaParser.Tests/NmeaMessages.cs
+++ b/src/UnitTests/NmeaParser.Tests/NmeaMessages.cs
@@ -124,6 +124,18 @@ namespace NmeaParser.Tests
             Assert.ThrowsException<ArgumentException>(() => NmeaMessage.Parse(input, ignoreChecksum: false));
         }
 
+        [TestMethod]
+        public void TestDPT()
+        {
+            string input = "$--DPT,149.5,000.5,1000.0*7F";
+            var msg = NmeaMessage.Parse(input);
+            Assert.IsInstanceOfType(msg, typeof(Dpt));
+            Dpt dpt = (Dpt)msg;
+            Assert.AreEqual(149.5, dpt.DepthMeters);
+            Assert.AreEqual(0.5, dpt.DepthOffsetMeters);
+            Assert.AreEqual(1000, dpt.MaxDepthRangeMeters);
+        }
+
         [TestMethod]
         public void TestGprma()
         {