Will never work.
Everything nowadays is a computer of some sort, as is your dvd-player... BUT you need compatibility AND an operating system supporting peripherals and software.
The operating system in a DVD-player is VERY basic and simple, won't cut it at all in power, leave alone compatibility with software...
Off course you need a lot of processing power to run complicated software. Even more if running on a "flexible" (meaning compatible with lots of software and hardware, also meaning a lot of abstraction layers) operating system that isn't optimized only for doing GPS (windows/linux can do a lot more, but aren't the most efficient because of their portability).
Much more then you asked for, but a very complete answer, don't you think?