| 摘要 |
A portable electronic communications apparatus includes a processing resource operably coupled to a Radio Data System communications unit. In at least one embodiment, the processing resource is also arranged to identify, when in use, a number of available frequencies capable of serving as a number of Alternative Frequencies, respectively. The processing resource communicates on a tuned frequency first Radio Data System data identifying the number of Alternative Frequencies. A data store is also operably coupled to the processing resource. The Radio Data System communications unit is arranged to re-tune, when in use, from the tuned frequency to another frequency of the number of available frequencies and to communicate on the another frequency second Radio Data System data, the re-tuning being supplemental to any re-tuning initiated as a result of inadequate signal strength associated with the tuned frequency. The number of Alternative Frequencies is kept below a certain maximum. The apparatus can be a navigation system.
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