The frequency of 8.397 MHz is quite rare; I can only find information about these.
The frequency of 8.397 MHz is primarily used for Maritime Mobile Service, and can also be used for Aeronautical Mobile Service.
According to the internationally recognized frequency allocation standard, 8.397 MHz falls within the 8.195 - 8.815 MHz band, which is primarily used for maritime mobile services. This means it is mainly used for communication between ships and coastal radio stations, as well as long-range (long-distance) communication between ships, distress calls, and broadcasting of safety information. As one frequency within this band, 8.397 MHz naturally also carries out these maritime communication functions.
Furthermore, because 8.397 MHz also operates at a high frequency.（HF）Within the range of aeronautical communication bands (2-30 MHz), it is sometimes used for remote communications with aircraft, such as aviation mobile services. However, its primary application is in maritime use.
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