Many newer ( 2010+ ) Ford models come equipped with a GPS Module, this is often the case regardless of trim level or additional upgrades ( navigation units ). Through the CANBUS of the vehicle, you ...

First, the ATmega48V only has one UART. This is connected to the GPS module at 9600, 8N1. The connection to the GSM M-590 module is only 2400 bps, and slow enough for a bitbanged UART.