What are the mandatory DSC watchkeeping bands/channels?
VHF Ch-70, 2 MHz MF DSC, 6 MHz DSC and 1 other HF DSC.
8 MHz HF DSC, 1 other HF DSC, 2 MHz MF DSC and VHF Ch-70.
2 MHz MF DSC, 8 MHz DSC, VHF Ch-16 and 1 other HF DSC.
None of the above.
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