NAV-PAC contains an internal 5 AH battery and noise suppression circuitry which provides a clean and stable source of DC power to vehicle transceivers, data terminals, fare boxes and navigation systems. Mobile electronics are highly vulnerable to shut down, reboot, data corruption caused by power drop out during engine start and low voltage from over worked batteries. RF Interference generated by alternators and motors also impedes proper operation. Nav-Pac addresses all these power issues and has proven very effective in ensuring proper operation of electronics in public safety vehicles, commercial fleets, and buses.