Frequency range Tx Rx   156.025–157.425MHz 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 Receive   5.5A (25W output) 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 Transmitter 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 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 Applicable U.S. Military Specifications The IC-M604 and HM-162B/SW have been tested to and passed the following MIL-STD requirements and strict environmental standards. Standard MIL 810 C MIL 810 D MIL 810 E MIL 810 F Method Proc Method Proc Method Proc Method Proc Low Pressure 500.1 I 500.2 I, II 500.3 I, II 500.4 I, II High Temp. 501.1 I 501.2 I, II 501.3 I, II 501.4 I, II Low Temp. 502.1 I 502.2 I, II 502.3 I, II 502.4-3 I, II Temp. Shock 503.1 I 503.2 I 503.3 I 503.4 I Solar Radiation 505.1 I 505.2 I 505.3 I 505.4 I Rain 506.1 I, II 506.2 I, II 506.3 I, II 506.4 I, II Humidity 507.1 I, II 507.2 II, III 507.3 II, III 507.4 – Salt Fog 509.1 I 509.2 I 509.3 I 509.4 – Dust Blowing 510.1 I 510.2 I 510.3 I 510.4 I Vibration 514.2 VIII, X 514.3 I 514.4 I 514.5 I Shock 516.2 I, II, V 516.3 I, IV 516.4 I, IV 516.5 I, IV   Measurements made in accordance with TIA/EIA 603. All stated specifications are subject to change without notice or obligation.   Supplied Accessories Hand microphone DC power cable Mounting bracket kit Dimensions Rear Panel View

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*. In addition, the polling (request/ reply) function checks whether a specific ship is within the communications range. * NMEA 0183 format is required. 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 Optional fully integrated COMMANDMICΙΙΙ™ 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