iFOREWORDThank you for purchasing this Icom product.The IC-M604A VHF MARINE TRANSCEIVER is designedand built with Icom’s state of the art technology and crafts-manship. With proper care, this transceiver should provideyou with years of trouble-free operation.We appreciate you making the IC-M604A your radio ofchoice, and hope you agree with Icom’s philosophy of “tech-nology fi rst.” Many hours of research and development wentinto the de sign of your IC-M604A.D FEATURES❍ Built-in DSC meets ITU Class D requirement❍ Front and rear panel microphone connection❍ Optional COMMANDMICII™ (HM-157) andCOMMANDMICIII™ (HM-162) are available andup to two COMMANDMIC™s can be connected❍ Easy to make individual DSC Calls using Icom’ sMA-500TR Class B AIS TransponderIMPORTANTREAD ALL INSTRUCTIONS carefully and completelybefore using the transceiver.SAVE THIS INSTRUCTION MANUAL — This in-struction manual contains important operating instructionsfor the IC-M604A.EXPLICIT DEFINITIONSCLEAN THE TRANSCEIVER AND MICROPHONETHOROUGHLY WITH FRESH WATER after exposure towater including salt, otherwise, the keys and switch maybecome inoperable due to salt crystallization.Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incor-porated (Japan) in Japan, the United States, the United Kingdom, Germany,France, Spain, Russia and/or other countries.COMMANDMIC is a registered trademark of Icom Incorporated (Japan) in theUnited States.WORD DEFINITIONR WARNING! Personal injury, fire hazard or electric shockmay occur.CAUTION Equipment damage may occur.NOTE Recommended for optimum use. No risk ofpersonal injury, fi re or electric shock.