| 摘要 |
A method is provided for improved navigation guidance in a portable navigation device ( 104 ) having a first navigation operating mode ( 302 ) for requesting ( 318, 324 ) and receiving ( 326, 334 ) routelet data and navigation route data and operating in accordance with the routelet data ( 332 ) and a second operation navigation mode ( 304 ) for operating in accordance with the navigation route data ( 338 ). The method includes in the first navigation operating mode ( 302 ), the steps of transmitting a routelet request ( 318 ) comprising location data, speed data and direction data, the location, speed and direction data determined ( 312, 314 316 ) in response to a present location, a present speed and a present direction of travel, respectively, of the portable navigation device ( 104 ), receiving routelet data ( 326 ) and operating in accordance with the received routelet data ( 332 ).
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