iPREFACEThank you for choosing this Icom product.This product is designed and built with Icom’s state of the arttechnology and craftsmanship. With proper care, this productshould provide you with years of trouble-free operation.D FEATURES❍ Simple operation with large keys❍ Easy to hear speaker❍ Built-in DSC meets ITU Class D requirement❍ Rugged waterproof construction❍ Optional COMMANDMICIV™ (HM-195)❍ Easy to make an individual DSC calls using the optionalClass B AIS Transponder❍ Built-in GPS (For only the IC-M423G and IC-M424G)❍ Built-in GPS receiver with a supplied GPS antenna(For only the IC-M423GE)IMPORTANTREAD ALL INSTRUCTIONS carefully and completelybefore using the transceiver.SAVE THIS INSTRUCTION MANUAL — This in-struction manual contains important operating instructionsfor the transceiver.EXPLICIT DEFINITIONSWORD DEFINITIONRWARNING! Personal injury, fire hazard or electricshock may occur.CAUTION Equipment damage may occur.NOTE If disregarded, inconvenience only. No riskof personal injury, fire or electric shock.CLEAN THE TRANSCEIVER AND MICROPHONE THOR-OUGHLY WITH FRESH WATER after exposure to saltwa-ter, and dry it before operating. Otherwise, the transceiver’skeys, switches and controllers may become unusable, dueto salt crystallization. Icom is not responsible for the destruction or damage to theIcom transceiver, if the malfunction is because of:• Force majeure, including, but not limited to, fires, earth-quakes, storms, floods, lightnings, or other natural disas-ters, disturbances, riots, war, or radioactive contamination.• The use of Icom transceiver with any equipment that is notmanufactured or approved by Icom.NOTE: If the transceiver’s waterproof protection appearsdefective, carefully clean it with a soft, damp (fresh water)cloth, then, dry it before operating.The transceiver may lose its waterproof protection if thecase or connector cover is cracked or broken, or the trans-ceiver has been dropped.