Patent ID: 7860650

Claim:
A navigation device with power-saving mechanism, comprising: a GPS receiver, for receiving a satellite signal of GPS to obtain a longitude-latitude information; a first processing unit, for switching from a first mode to a second mode according to a control signal, and outputting a destination information and an enabling signal during the process of switching from the first mode to the second mode, wherein the first processing unit is in disabled mode when the first processing unit switches from the first mode to the second mode; a second processing unit, being enabled according to the enabling signal for comparing the longitude-latitude information with the destination information, and generating a direction information and a distance information according to the comparison result; and a sound playing unit, for selecting two navigation frequencies among a plurality of navigation frequencies as a first frequency and a second frequency according to the direction information and the distance information, and playing a tone signal comprised of the first frequency and a tone signal comprised of the second frequency in sequence.