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Libraries/Esiur/Security/Integrity/NMEA0183.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Esiur.Security.Integrity;
+
+public class NMEA0183
+{
+    public static byte Compute(string data)
+    {
+        return Compute(data, 0, (uint)data.Length);
+    }
+
+    public static byte Compute(string data, uint offset, uint length)
+    {
+        byte rt = 0;
+        var ends = offset + length;
+        for (int i = (int)offset; i < ends; i++)
+            rt ^= (byte)data[i];
+
+        return rt;
+    }
+}
+