| 摘要 |
A postal code system and method comprised a first GPS signal receiving portable device (10) that determines a postcode for the instant position of the first portable device (10) dependent upon the position on the surface of the earth of the first portable device (10). The system and method also comprises a second GPS signal receiving portable device that has the postcode inputted therein, determines the desired position of the postcode, finds its position by GPS and issues indication to delivery personnel how far and in what direction to move to arrive at the postcode- indicated location. First (10) and second (18) portable devices can be included in a combined portable device (10, 18) such as a GPS enabled portable telephone. A position determining algorithm and a postcode deliver algorithm, opposite in action to the action of the postcode determining algorithm, are employed. The postcode determining algorithm randomises at least one of the postcode characters, to avoid easy determination of a postcode from a position and vice versa. |
