Methods and apparatus for adjusting heading direction in a navigation system

A method of adjusting heading direction in a mobile device comprising:

• generating compass data corresponding to an orientation of the mobile device relative to true north;
• receiving a global positioning system (GPS) signal from a plurality of satellites;
• determining a heading direction of a vehicle transporting the mobile device relative to true north based on the GPS signal when the vehicle is moving above a threshold velocity;
• generating motion data corresponding to a motion of the mobile device when the mobile device is moved;
• and
• adjusting the heading direction of the vehicle relative to true north based on the compass data when the vehicle is moving below the threshold velocity.

A mobile device comprising:

• a display for displaying a route of the mobile device, the route including a pointer overlaid on the route, a direction of the pointer indicating the heading direction of a vehicle transporting the mobile device and a position of the pointer indicating a position of the vehicle on the route;
• an electronic compass generating compass data corresponding to an orientation of the mobile device relative to true north, the compass data being displayed on the display;
• a global positioning system (GPS) module receiving a GPS signal from a plurality of satellites, the GPS module determining a heading direction of a vehicle transporting the mobile device relative to true north based on the GPS signal when the vehicle is moving above a threshold velocity;
• a motion sensor generating motion data corresponding to a motion of the mobile device when the mobile device is moving;
• and
• a processor adjusting the heading direction of the vehicle relative to true north based on the compass data when the vehicle is moving below the threshold velocity.