Patent ID: 8223071

Claim:
A handheld electronic apparatus, for receiving a satellite signal, comprising: a positioning module, for generating location information according to the satellite signal; a sensing module, for detecting a vertical tilted angle relative to a horizontal plane and a horizontal observing direction relative to a compass, the vertical tilted angle and the horizontal observing direction being associated with a positioned state of the handheld electronic apparatus, wherein the sensing module senses a horizontal observing direction in an original direction when the vertical tilt angle is less than 90 degrees and senses a horizontal observing direction in an opposite direction when the vertical tilt angle is greater than 90 degrees, and wherein the horizontal observing direction is adjusted to an opposite direction to the original direction when the vertical tilted angle is greater than 90 degrees; a constellation database, stored with constellation data; and a processing module, coupled to the positioning module, the sensing module and the constellation database, for retrieving real-time constellation information from the constellation data according to the location information, the vertical tilted angle, the horizontal observing direction, and timing information.