초록 ▼

A method apparatus for orienting a map display in a mobile or portable device. An electronic compass is integrated with a hand-held portable or mobile mapping device and an electronic compass bearing is used to calculate an offset value with respect to the map default orientation. The map is thus re

A method apparatus for orienting a map display in a mobile or portable device. An electronic compass is integrated with a hand-held portable or mobile mapping device and an electronic compass bearing is used to calculate an offset value with respect to the map default orientation. The map is thus reoriented in the display to the direction of the device. In an alternative embodiment, a GPS receiver is also integrated with the device. A heading fix is calculated from two or more GPS position fixes to determine orientation of the device. When a heading fix is unavailable, such as at initial start-up of the device, a compass heading is used in lieu of the GPS heading fix to orient the map on a display.

대표청구항 ▼

1. A mobile device comprising:a map memory; a GPS receiver operable to output position fixes; a compass operable to output compass headings; a controller coupled to said memory and operable to recall a map therefrom, and coupled to said GPS receiver and operable to calculate a heading fix based on a

1. A mobile device comprising:a map memory; a GPS receiver operable to output position fixes; a compass operable to output compass headings; a controller coupled to said memory and operable to recall a map therefrom, and coupled to said GPS receiver and operable to calculate a heading fix based on a first and a second position fix read therefrom, and coupled to said compass and operable to read a compass heading therefrom; a display coupled to said controller, and wherein said controller calculates a map offset value indicative of the difference between said heading fix and the orientation of said map, and if said heading fix is unavailable, said controller calculates an offset value indicative of the difference between said compass heading and the orientation of said map and said controller is operable to write said map to said display in accordance with said offset value.