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   Home  HF Systems  HAP Charts Sunday, Jul 20 2008 21:15 UT
Global HF 
HAP Charts

    HAP charts are designed for communications between a specified base and mobile within a nominated area.

  • Each chart shows colours which represent the recommended HF frequencies for contacting the base or mobile within the area bounded by the chart for a particular hour.

  • The geographic zone, which is variable, is represented by a map showing latitude and longitude.

  • Charts are in Universal Time (UT).


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