First of all this becomes obvious when you decide to upgrade old car engine with newer model. The whole wiring, adapting motor with different ECU takes long time because it also controls other areas of vehicle like speedometer and other indicators. To make it all work in other vehicle it can be really difficult and time consuming.
The regular GPS pins (RX, TX) can be connected to D0-D7 of Arduino. Adding GPS to your Arduino has never been easier. Multiple GPS receivers attach easily to the shield, and with the example sketch (check below), you will be able to locate your exact position within a few meters. Here's where we are.