The utility model discloses a circuit board which is provided with a transverse portion and a longitudinal portion. A GPS (global positioning system) receiver positioned at the left lower corner of the transverse portion is arranged on the upper surface of the transverse portion, the GPS receiver, an audio coder-encoder, a GSM (global system for mobile communications) transmitting/receiving device, a GSM signal amplifier and a GSM antenna are sequentially arranged along the longitudinal portion forming direction, the GPS receiver and the audio coder-encoder are positioned on the transverse portion, the GSM transmitting/receiving device, the GSM signal amplifier and the GSM antenna are positioned on the longitudinal portion, a GPS memory, a GPS central processing unit, a GSM central processing unit and a GSM memory are sequentially arranged along the longitudinal portion forming direction, the GPS memory and the GPS central processing unit are positioned on the transverse portion, and the GSM central processing unit and the GSM memory are positioned on the longitudinal portion. Compared with the prior art, the circuit board has the advantages that various elements of the circuit board are reasonably arranged, the area of the circuit board and the volume of a navigator are effectively reduced, and connection among the circuit board and components such as a battery is reasonable and is stable in performance. The utility model further provides the navigator with functions of a mobile phone.