return;

            }

            else if (!rawDataReceived.StartsWith("KD8TDF"))

            {

                AddTextDelegate("Foreign transmission: " + rawDataReceived + "\r\n");

                return;

            }

            /* sample stansmissions

             * KD8TDF-9>APRS,WIDE2-1:/191950zN/WO/ T79 S00 V H99.99 _ |

             * KD8TDF-9>APRS,WIDE2-1:/151916z3944.87N/08348.75WO005/0.013 SV:09 A-30.5 B45.64 C99542

             */

            //find and store latitude string

            int indexStart = rawDataReceived.IndexOf("z");

            int indexEnd = rawDataReceived.IndexOf("N/");

            latitude = rawDataReceived.Substring(indexStart + 1, indexEnd - indexStart - 1);

            //find and store longitude string

            indexStart = rawDataReceived.IndexOf("N/");

            indexEnd = rawDataReceived.IndexOf("WO");

            longitude = rawDataReceived.Substring(indexStart + 2, indexEnd - indexStart - 2);

            //remove APRS overhead from string

            //place each datum in its own variable

            string[] dataTransmission;

            dataTransmission = transmissionCommentField.Split('~');

            //variables for processing datums

            string typeCode;

            string data;

            string csvData = "";

            string testString = "";

            //loop through all datums in the transmission and send them to the chart builder

            {

                {

                    firstTransmissionDatum = true;

                }

                else

                {

                    firstTransmissionDatum = false;

                }

                //remove unwanted characters

                dataTransmission[i] = dataTransmission[i].Trim();

                //zero not always trasmitted properly so add '0.0' to any transmission with no data

                if (dataTransmission[i].Length == 1) 

                {

                    dataTransmission[i] += "0";

                }

                //pull out data and data type and send to processing function

                typeCode = dataTransmission[i].Substring(0, 1);

                if (typeCode != "e")

                {

                    testString = dataTransmission[i].Substring(1);

                    data = dataTransmission[i].Substring(1);

                    processTransmissionDatum(typeCode, data);

        //write the data to CSV file -- usually seniordesign-ui\Demo.WindowsForms\bin\Debug

        private void WriteToCSV(string data)

        {

            string path = Directory.GetCurrentDirectory();

            string filename = path+"\\TransmissionData" + unixTime.Milliseconds + ".csv";

            using (StreamWriter writer = new StreamWriter(filename, true))

            {

                writer.WriteLine(data);

            }

        }

        //must change lat/long coords to properly place map marker

        float conv_coords(float in_coords)

        {

            //Initialize the location.

            float f = in_coords;

            // Get the first two digits by turning f into an integer, then doing an integer divide by 100;

            // firsttowdigits should be 77 at this point.

            int firsttwodigits = ((int)f) / 100;                               //This assumes that f < 10000.

            float nexttwodigits = f - (float)(firsttwodigits * 100);

            float theFinalAnswer = (float)(firsttwodigits + nexttwodigits / 60.0);

            return theFinalAnswer;

        }

        // add marker from an APRS transmission - MDKEdit

        private void addTrackerMarker(string lat, string lng)

        {

            double latitude = double.Parse(lat), longitude = double.Parse(lng);

            PointLatLng APRSloc = new PointLatLng();

            APRSloc.Lat = conv_coords((float)latitude);

            APRSloc.Lng = conv_coords((float)longitude)*-1;

            GMarkerGoogle m = new GMarkerGoogle(APRSloc, GMarkerGoogleType.blue_small);

            m.ToolTipText = "Tracker";

            m.ToolTipMode = MarkerTooltipMode.Always;

            objects.Markers.Add(m);

        }

        //places text in the message box

        delegate void SetTextDelegate(string value);

        public void AddTextDelegate(string value)

        {

            if (InvokeRequired)

            {

                Invoke(new SetTextDelegate(AddTextDelegate), value);

            }

                        tboxMasterBatteryLevel.BackColor = Color.Chartreuse;

                    }

                    else if (dataString.StartsWith("0")) //Atmo Module

                    {

                        tboxAtmoBatteryLevel.Text = dataString.Substring(1);

                        tboxAtmoBatteryLevel.BackColor = Color.Chartreuse;

                    }

                    else if (dataString.StartsWith("1"))  //Geiger Module

                    {

                        tboxGeigerBatteryLevel.Text = dataString.Substring(1);

                        tboxGeigerBatteryLevel.BackColor = Color.Chartreuse;

                    }

                    else if (dataString.StartsWith("2")) //Camera Module

                    {

                        tboxCameraBatteryLevel.Text = dataString.Substring(1);

                        tboxCameraBatteryLevel.BackColor = Color.Chartreuse;

                    }

                }

                else if (dataType.Equals("i")) //Info Message

                {

                    AddTextDelegate("Info: " + data + "\r\n");

                }

                ///MASTER MODULE DATA TYPES

                {

                    //TODO: check math and decimal placement

                    latitude += data.ToString();

                    tboxMasterLatitude.Text = latitude;

                    tboxMasterLatitude.BackColor = Color.Chartreuse;

                }

                {

                    //TODO: check math and decimal placement

                    longitude += data.ToString();

                    tboxMasterLongitude.Text = longitude;

                    tboxMasterLongitude.BackColor = Color.Chartreuse;

                }

                else if (dataType.Equals("h"))  //HDOP

                {

                    tboxMasterHDOP.Text = data.ToString();

                    tboxMasterHDOP.BackColor = Color.Chartreuse;

                }

                else if (dataType.Equals("v"))  //Velocity

                {

                    chrtBottomRight.Series.FindByName("velocityTrend").Points.AddY(double.Parse(data));

                    velocitySum += double.Parse(data);

                    tboxMasterVelocity.Text = data.ToString();

                    tboxMasterVelocity.BackColor = Color.Chartreuse;

                }

                else if (dataType.Equals("s"))  //satellites in view

                {

                    tboxMasterSatellites.Text = data.ToString();

                    tboxMasterSatellites.BackColor = Color.Chartreuse;

                }

using System;

using System.Collections;

using System.Collections.Generic;

using System.Diagnostics;

using System.Net;

using System.Net.NetworkInformation;

using System.Runtime.InteropServices;

using System.Text;

using System.Windows.Forms;

using System.IO;

using System.IO.Ports;

using System.Threading;

namespace Demo.WindowsForms

{

   class Program

   {

      /// <summary>

      /// The main entry point for the application.

      /// </summary>

      /// 

       // Instantiate the communications port 

       static MainForm windowGUI;

      [STAThread]

      static void Main()

      {

          Application.SetCompatibleTextRenderingDefault(false);

          var program = new Program();

          windowGUI = new MainForm();

          program.SerialInitialize();

         Application.EnableVisualStyles();

         Application.Run(windowGUI);

      }

      //inits the serial port and event handler

      private void SerialInitialize()

      {

          // http://msmvps.com/blogs/coad/archive/2005/03/23/SerialPort-_2800_RS_2D00_232-Serial-COM-Port_2900_-in-C_2300_-.NET.aspx

          // Attach a method to be called when there is data waiting in the port's buffer

          port.DataReceived += new SerialDataReceivedEventHandler(ReceiveData);

          // Open the port for communications

          port.Open();