Com Port (GPS=>Setup)
Use this drop-down menu to choose the serial communications port that you use to connect your GPS receiver. Serial ports on computers are called COM1, COM2, COM3, and so on. If your computer has only one serial port, it is probably COM1. Some modern computers don't have serial ports, and you need to use a USB-to-serial converter; in this case, your communications port might be COM3, COM5, or some other designation other than COM1. If you are having trouble communicating with your GPS receiver, consult your computer's configuration or documentation to determine what to choose for this field.