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<Latitude>0.5310163376</Latitude>
<Longitude>-0.1683369985</Longitude>

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lon="-15.473166666666666" lat="28.141166666666667"

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using System;
using System.IO;
using System.Text;
using System.Globalization;

namespace Koordinaten
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			if (args.Length != 1) {
				Console.WriteLine ("Es muss eine .xml als Argument übergeben werden");
				return;
			}
			string xml;
			using (StreamReader sr = new StreamReader(args[0])) {
				xml = sr.ReadToEnd ();
			}
			xml = xml.Remove (0, xml.IndexOf ("<Name>") + 6);
			string name = xml.Substring (0, xml.IndexOf ("</Name>"));
			StringBuilder output = new StringBuilder ();
			output.AppendLine ("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
			output.AppendLine ();
			output.AppendLine ("-<sposroutetemplate xmlns=\"http://www.meteogroup-maritime.com/spos/routetemplate\" xmlVersion=\"1\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">");
			output.AppendLine ();
			output.AppendLine ();
			output.AppendLine ("-<template created=\"2015-02-23T14:13:58.5077114Z\" name=\"" + name + "\">");
			output.AppendLine ();
			output.AppendLine ();
			output.AppendLine ("-<waypoints>");
			output.AppendLine ();
			while (xml.IndexOf("</Waypoints>") > 0) {
				xml = xml.Remove (0, xml.IndexOf ("<Name>") + 6);
				name = xml.Substring (0, xml.IndexOf ("</Name>"));
				xml = xml.Remove (0, xml.IndexOf ("<Latitude>") + 10);
				double latitude = double.Parse (xml.Substring (0, xml.IndexOf ("</Latitude>")), CultureInfo.InvariantCulture) * 180 / Math.PI;
				xml = xml.Remove (0, xml.IndexOf ("<Longitude>") + 11);
				double longitude = double.Parse (xml.Substring (0, xml.IndexOf ("</Longitude>")), CultureInfo.InvariantCulture)* 180 / Math.PI;
				xml = xml.Remove (0, xml.IndexOf ("</Waypoints>") + 12);
				output.AppendLine ("<waypoint name=\"" + name + "\" ignoreLand=\"false\" routeTemplatePointType=\"Fixed\" tracktype=\"RhumbLine\" useSpeed=\"false\" speed=\"0\" delay=\"PT0S\" lon=\"" + longitude.ToString (CultureInfo.InvariantCulture) + "\" lat=\"" + latitude.ToString (CultureInfo.InvariantCulture) + "\"/>");
				output.AppendLine ();
			}
			output.AppendLine ("</waypoints>");
			output.AppendLine ();
			output.AppendLine ("</template>");
			output.AppendLine ();
			output.AppendLine ("</sposroutetemplate>");
			Console.Write (output.ToString ());
		}
	}
}

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Koordinaten.exe Quelldatei > Zieldatei

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace XMLConverter
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void buttonBrowseSource_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            if (ofd.ShowDialog() == DialogResult.OK)
                textBoxSource.Text = ofd.FileName;
        }

        private void buttonBrowseDest_Click(object sender, EventArgs e)
        {
            SaveFileDialog sfd = new SaveFileDialog();
            if (sfd.ShowDialog() == DialogResult.OK)
                textBoxDest.Text = sfd.FileName;
        }

        private void buttonStart_Click(object sender, EventArgs e)
        {
            string xml;
            try
            {
                using (StreamReader sr = new StreamReader(textBoxSource.Text))
                {
                    xml = sr.ReadToEnd();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Fehler beim Lesen der Datei:\n\n" + ex);
                return;
            }
            xml = xml.Remove(0, xml.IndexOf("<Name>") + 6);
            string name = xml.Substring(0, xml.IndexOf("</Name>"));
            StringBuilder output = new StringBuilder();
            output.AppendLine("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            output.AppendLine();
            output.AppendLine("<sposroutetemplate xmlns=\"http://www.meteogroup-maritime.com/spos/routetemplate\" xmlVersion=\"1\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">");
            output.AppendLine();
            output.AppendLine();
            output.AppendLine("<template created=\"2015-02-23T14:13:58.5077114Z\" name=\"" + name + "\">");
            output.AppendLine();
            output.AppendLine();
            output.AppendLine("<waypoints>");
            output.AppendLine();
            while (xml.IndexOf("</Waypoints>") > 0)
            {
                xml = xml.Remove(0, xml.IndexOf("<Name>") + 6);
                name = xml.Substring(0, xml.IndexOf("</Name>"));
                xml = xml.Remove(0, xml.IndexOf("<Latitude>") + 10);
                double latitude = double.Parse(xml.Substring(0, xml.IndexOf("</Latitude>")), CultureInfo.InvariantCulture) * 180 / Math.PI;
                xml = xml.Remove(0, xml.IndexOf("<Longitude>") + 11);
                double longitude = double.Parse(xml.Substring(0, xml.IndexOf("</Longitude>")), CultureInfo.InvariantCulture) * 180 / Math.PI;
                xml = xml.Remove(0, xml.IndexOf("</Waypoints>") + 12);
                output.AppendLine("<waypoint name=\"" + name + "\" ignoreLand=\"false\" routeTemplatePointType=\"Fixed\" tracktype=\"RhumbLine\" useSpeed=\"false\" speed=\"0\" delay=\"PT0S\" lon=\"" + longitude.ToString(CultureInfo.InvariantCulture) + "\" lat=\"" + latitude.ToString(CultureInfo.InvariantCulture) + "\"/>");
                output.AppendLine();
            }
            output.AppendLine("</waypoints>");
            output.AppendLine();
            output.AppendLine("</template>");
            output.AppendLine();
            output.AppendLine("</sposroutetemplate>");
            try
            {
                using (StreamWriter sw = new StreamWriter(textBoxDest.Text))
                    sw.Write(output.ToString());
                MessageBox.Show("erledigt!");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Fehler beim Schreiben der Datei:\n\n" + ex);
            }
            
        }
    }
}