The Icom M604 is the latest in marine VHF technology, from a name you trust and at a price that won't break your budget.
Superior receiver performance
The IC-M604 has excellent receive specifications* which allow a weak signal a better chance of being heard when louder signals are around it. The powerful 5.0W (typical) audio output from the front facing speaker further increases the audibility and quality of received calls.
* More than 80dB for intermodulation rejection and adjacent channel selectivity, and 0.22μV (typical) high sensitivity.
Large LCD with dot-matrix characters
The 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.
30 Watt 2-way hailer capability
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.
Submersible construction (1m depth for 30 minutes)
The IC-M604, including the supplied microphone, withstands submersion in up to 1.0m depth of water for 30 minutes. It is equivalent to IPX7 waterproofing (except cables).
Built-in ITU Class-D DSC
No matter what channel you're tuned to, a separate and independent receiver inside the M604 continuously monitors Ch. 70. The 10-keypad allows simple and efficient operation of the DSC emergency functions, vital for your safety at sea
Position request and position report
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 (NMEA 0183 format is required). In addition, the polling (request/ reply) function checks whether a specific ship is within the communications range.
Improved GPS information indication
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.
Front and rear panel microphone connection
The speaker microphone can be detached from the front panel and can be connected to the rear panel without any modification. An optional 6.1m (20ft) microphone extension cable, OPC-1000, is available.
RX speaker function
 The RX speaker function, "receiver-repeater" allows you to monitor the received radio audio from a hailer horn on the deck or tower. You can also make an announcement on-board from the microphone.
Favorite channel function
This function allows quicker channel selection. Set the "TAG" channel to the channels used most often. When pushing the up/down buttons on the speaker microphone, only tagged channels are selected and untagged channels are skipped. The "TAG" scanning function detects only tagged channels.
Other features
- Dual/tri-watch function for monitoring Ch.16 and/or call channel
- 7 levels adjustable backlit display and keypad
- Optional voice scrambler, UT-112 for private communication
- Weather channels with weather alert function
- AquaQuake draining function emits a vibrating sound and clears water away from the speaker grill
Up to two COMMANDMICIIIs can be connected
The optional COMMANDMICIII provides a 2nd and/or 3rd station capability to operate the IC-M604 from up to 18.3m* (60ft) away such as the cabin and/or fly bridge. (Requires use of two optional OPC-1541 extension cables.)
Full control and intercom capability
All functions of the IC-M604, including distress call, DSC, and hailer, are available. The intercom function allows you to talk with the IC-M604 or another COMMANDMIC. Remote power on/off function remotely turns on/off the IC-M604.
Multi-function rotary dial
A newly designed multi-function rotary dial gives you quick and easy access to many IC-M604 settings, including operating channel, volume, squelch, menu settings and more.
Other features
- Full dot-matrix LCD with 7-step dimmer setting
- 2.8W (typical) external speaker terminal
- Submersible PLUS waterproof (1.5m depth for 30 minutes)
- Extra large 45mm (d) speaker for superior audio
General Specifications
- 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: –20°C to +60°C; range –4°F to +140°F
- Antenna impedance: 50Ω (SO-239)
- Dimensions (W×H×D): 220×110×109.4 mm; (projections not included) 821⁄32×411⁄32×45⁄16 in.
- Weight (approx.): 1.4kg ; 3.09 lb
- NMEA formats :
- Input RMC, GGA, GNS, GLL, VTG
- Output DSC, DSE
Transmitter Specifications
- 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
Receiver Specifications
- Intermediate freq.:
- 1st 30.15MHz
- 21.7MHz (Ch70)
- 2nd 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
Supplied Accessories:
- Hand microphone
- DC power cable (6.1m/ 20ft)
- Mounting bracket kit
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