[header] How to install a gps navigation system for your automobile [title] Note that this unit is compatible only for vehicles come with a 12-volt battery and negative grounding. [title] Avoid short circuits in the vehicle electrical system during installation. [step] Be sure to disconnect the negative terminal (-) from the battery before the installation. 
[title] Secure all wiring with cable clamps or electrical tapes. [step] Do not allow any bare wiring to remain exposed.