25 Watt VHF Marine Mobile Transceiver with Class D DSC


Intuitive User Interface and White Backlit LCD and Keypad

Incorporating Icom's common Marine Family User Interface designed for simple, intuitive operation. A rotary selector and directional keypad provide quick and easy access to the intended functions. The high contrast white backlit LCD and laser-cut keypad match well with modern boat designs.

Active Noise Cancelling

The built-in active noise cancelling provides superb performance. It reduces background noise up to 90% in the received signal and 30% in the transmits signal.

10 W Loud Audio, Public Address and Foghorn

The IC-M423G has a built-in 10 W amplifier that increases the audio output to an external PA speaker. The public address function allows you to make an announcement from the microphone like a loud speaker, the foghorn can also be emitted from the external PA speaker.

Built-in Class D DSC

The built-in DSC watch function monitors Ch. 70 (DSC channel) activity, even while you are receiving another channel. DSC functions include: distress, individual, group, all ships, urgency, safety, position request/report, polling request and DSC test calls.

Built-in GPS Receiver


GPS antenna Supplied

The built-in GPS receiver shows your current position, date/time and can be used for DSC calls. The GPS data source is selectable from internal and external GPS.

Optional White Backlit COMMANDMIC™ HM-195GB/GW

The optional white backlit COMMANDMIC makes it convenient for using the IC-M423G from a separate cabin or tower. All functions of the IC-M423G can be controlled from the COMMANDMIC and can be used as an intercom with the IC-M423G.

AIS Target Call with MA-510TR

When connected to the optional MA-510TR >Class B AIS transponder, the AIS target call function allows you to make an individual DSC call without having to manually input an MMSI number.

Other Features

  • Simple remote control speaker-microphone, HM-205B/SW
  • NMEA 0183 connectivity
  • MarineCommander™ compatible
  • AquaQuake™ draining function
  • IPX7 waterproof protection (1m depth for 30 minutes)
  • Dual/tri-watch function for monitoring Ch.16 and/or call channel
  • Priority and normal scan
  • Black and super white versions available


Frequency range TX 156.000–161.450 MHz
RX 156.000–163.425 MHz
CH70 156.525 MHz
Usable channels INT, USA* channels
* Available depending on version
Type of emission 16K0G3E (FM), 16K0G2B (DSC)
Power supply requirement 13.8 V DC nominal
(10.8-15.6 V DC)
Current drain
(at 12.0V DC)
TX 25 W output 5.5 A
RX AF max. External SP 5.0 A
Internal SP 1.5 A
Operating temperature range −20°C to +60°C
Antenna impedance 50 Ω (SO-239)
Dimensions (W×H×D)
(projections not included)
180×82×119.9 mm
Weight (approx.) 1.2 kg
NMEA in/out formats RMC, GGA, GNS, GLL, DSC, DSE


Output power (at 12.0 V DC) 25 W, 1 W
Max. frequency deviation ±5.0 kHz
Frequency stability Less than ±1.5 kHz
Spurious emissions Less than 0.25 μW


Sensitivity (20 dB SINAD) −5 dBμ emf typ.
Squelch sensitivity Less than −2 dBμ emf
Adjacent channel selectivity More than 70 dB
Spurious response More than 70 dB
Intermodulation More than 68 dB
Audio output power
(at 10% distortion, 4 Ω load)
More than 10 W (Ext. speaker)

GPS Receiver

Receiving frequency 1575.42 MHz
Receiving channels 66 channels
Satellite differential type WAAS, EGNOS, MSAS, GAGAN

Applicable IP Rating

Ingress Protection Standards

IPX7 (Waterproof protection)

All stated specifications are subject to change without notice or obligation.

Supplied Accessories

  • Hand microphone, HM-205B/SW
  • DC power cable
  • Mounting bracket kit
  • GPS Antenna with 5m cable
Brand Icom
Unit Of Measure ea

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