Method of applying a spherical correction to map data for rendering direction-of-travel paths on a wireless communications device

A non-transitory computer-readable storage medium comprising code recorded on the computer-readable medium that, when loaded into memory and executed on a processor of a wireless communications device, causes the wireless communications device to:

• obtain map data for rendering the map to be displayed on the wireless communications device;
• determine a rotation angle to be applied to the map;
• rotate the map by the angle of rotation by applying a single spherical correction factor to all vertices of the map data, the spherical correction factor being calculated in real-time only from a trigonometric function of the rotation angle and a latitude of a center of the map;
• and
• render a rotated and corrected map on a display of the wireless communications device.

A wireless communications device for displaying a map, the wireless communications device comprising:

• an input device to cause the wireless communications device to obtain map data for rendering the map to be displayed on the device;
• a processor for determining a rotation angle to be applied to the map and for rotating the map by the angle of rotation by applying a single spherical correction factor to all vertices of the map data, the spherical correction factor being calculated in real-time only from a trigonometric function of the rotation angle and a latitude of a center of the map;
• and
• a display for displaying a rotated and corrected map.