If the vessel is experiencing atmospheric interference with NAVTEX broadcasts, especially in the tropics, the GMDSS operator should:
Select one of the 8 HF MSI frequencies and set-up the transceiver in FEC TELEX mode.
Select one of the 6 HF MSI frequencies and set-up the transceiver in ARQ TELEX mode.
Select one of the 6 MF MSI frequencies and set-up the transceiver in FEC TELEX mode.
Select the MF MSI frequency dedicated to tropical MSI and set-up the transceiver in FEC TELEX mode.
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