Need help with building navigation system

ok bro, I don't know what you meant by saying you're going to buy a navigation dvd to play in a dvd player. To my knowledge, that won't work. You have to have a special dvd nav unit to do that such as the alpine nve. You can use these units with your pyle tv but you'll have to get a special connector with most of the navi units. These units will probably run you at least 1 stack. ($1000). You cannot Make a GPS nav system. Also something that you can do is if you have a laptop you can get a GPS navi system. The best ones don't even come close to the price of the specialized ones from alpine and kenwood but they are probably just as good. They come with the maps on cd and the serial port GPS. That's just another route to take. I hope I been of some assisstance.