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ICOM M604A VHF Marine Radio

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Product Description

ICOM M604A VHF marine radio has excellent receive specifications which allow a weak signal a better chance of being heard when louder signals are around it. The M604A powerful 5.0W (typical) audio output from the front facing speaker further increases the audibility and quality of received calls.

The M604A large full dot-matrix display is designed for optimum readability in any lighting condition. With the extra large font, the channel number is maximized on the display and upper and lower case characters can be easily read.

When connected to an external hailer horn, communication with other boats, deck or dock hands is easy. The built-in 30W amplifier increases your talk power making your message loud and clear. Four foghorn patterns are also available.

Over and above the DSC, your own and other ships’ position data can be exchanged with the position request or position report functions. The received position information can be transferred to external GPS or navigation equipment. In addition, the polling (request/ reply) function checks whether a specific ship is within the communications range. NMEA 0183 format is required.

When connecting to an external GPS receiver, the GPS information indication function shows course and speed data as well as position, date and time on the display.

ICOM M604A Features

  • IPX-7 Submersible Waterproof
  • Built in Class D DSC
  • Favorite Channel Button that allows you to put your most used channels at a touch of a button
  • Plug and play speakermic allows for easy installation from the back of the radio, or front.
  • AquaQuake water removal system makes sure that water doesn’t interfere with the front speaker.
  • 2 Colors available: M604 21 (Black) & M604 22 (Grey)
  • Built-in CLASS D DSC capability with extended DSC functionality.
  • 2-way 30W Hailer, RX repeater, & Fog Horn
  • ‘Force 5 audio’ with 5 watts of audio for loud and clear reception even in noisy conditions.
  • NMEA input/output for GPS receiver connection (Position Send, Position Request, and Group Call data all shown on the display).
  • Huge backlit LCD display is easy to see in bright sun, or in the dark of night.
  • Class leading; superior electrical specifications and receive performance blows away the competition.
  • Dual & Tri watch, plus multiple scan modes including ICOM’s exclusive “tag” scan which is the easiest to use in the industry.
  • External speaker connection.
  • Built in intercom when used in conjunction with the, COMMANDMIC II, or COMMANDMIC III.
  • Up to 2 COMMANDMIC IIIs with full radio integration
  • Dimensions: 8.66" w x 4.33" h x 4.3" d
  • 3 year Warranty


Frequency range
Tx 156.025–157.425MHz
Rx 156.050–163.275MHz
Type of emission 16K0G3E, 16K0G2B
Usable channels  USA, INT, CAN, WX channels
Power supply requirement  13.8V DC ±15%
Current drain (at 13.8V DC)
Transmit 5.5A (25W output)
Receive  1.5A (Max. audio)
Operating temperature range  –20°C to +60°C ; –4°F to +140°F
Antenna impedance 50Ω (SO-239)
Dimensions (W×H×D) (projections not included) 220×110×109.4 mm; 821⁄32×411⁄32×45⁄16 in.
Weight (approx.) 1.4kg ; 3.09 lb

NMEA formats Input/Output  RMC, GGA, GNS, GLL, VTG, DSC, DSE

Output power 25W or 1W (at 13.8V DC)
Modulation system Variable reactance
Max. Freq. deviation ±5.0kHz
Frequency error ±0.3kHz
Spurious emissions Less than –70dBc
Residual modulation More than 40dB
Adjacent Ch. power More than 70dB

Intermediate freq. 1st/2nd  30.15MHz 21.7MHz (Ch70) 450kHz 
Sensitivity 0.22μV typ. (at 12dB SINAD)
Squelch sensitivity Less than 0.32μV (threshold)
Adjacent Ch. selectivity More than 80dB
Spurious response More than 80dB
Intermodulation More than 80dB
Hum and noise More than 40dB
Audio output power 5.0W typ. at 10% distion with a 4Ω load



  • M604A VHF
  • Hand microphone
  • DC power cable
  • Mounting bracket kit
  • Owner's manual

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    Product Reviews

    1. A good receive. Would buy again

      Posted by Ryan Mcdonald on 24th Aug 2015


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