6A3 - 2182 kHz is the international radiotelephone distress frequency. It is also used for a calling channel. The authorized mode of emission is H3E (single-sideband full carrier). A3E (double-sideband full carrier) is only authorized for equipment:

A.Solely intended for distress and safety communications

B.Built and sold after the GMDSS implementation date

C.Built and sold before the GMDSS implementation date

D.Solely intended for ship-to-shore public correspondence