The keypad is how the user is going to be able to interface with the device. The pad will take in the latitude and longitude data input from the user and send it to the micro-controller. The transmission is done using an EDE1144 keypad encoder. This chip was designed to do just this task. The chip features a trasmission rate of 2400 or 9600 baud serially or the chip can trasmit the data parallely. Right now I am trasmittion the data using the UART on the micro-controller and trasmitting the data at 2400 baud serially.