YOUR ADVANCED COMMUNICATION SOLUTION
Stay connected and aware on the water with Garmin Signal VHF 400, the marine radio with advanced features and a color touchscreen display.
BUILT-IN CLASS B AIS SOTDMA TRANSPONDER
3.5-INCH COLOR TOUCHSCREEN DISPLAY
CRYSTAL-CLEAR COMMUNICATION WITH ADAPTIVE NOISE CANCELLATION
INTUITIVE CLASS D DIGITAL SELECTIVE CALLING (DSC)
INCLUDES FIST MIC WITH BUILT-IN SPEAKER
COMPACT DESIGN TAKES UP MINIMAL SPACE AT THE HELM
WHAT YOU’LL LOVE

BUILT-IN AIS
Stay aware on the water with built-in AIS transmit and receive capabilities. This feature shows you range, course, speed and the crossing situation of other AIS-equipped vessels around you to help you navigate.

SLEEK DESIGN
The compact and modern design features edge-to-edge glass and takes up minimal space at the helm.

CLEAR AND SIMPLE COMMUNICATION
Eliminate unnecessary radio noise with automated squelch. If you miss a radio message, you can replay it with VHF audio playback. When you need to maintain watch on multiple channels, advanced watch modes make it easy.

STAY CONNECTED
Quickly transmit a distress signal to nearby vessels with the distress button, which uses Class D DSC to automatically send crucial information that can help emergency responders. You can also use the intuitive DSC features to quickly initiate contact with other AIS-equipped vessels; simply select the vessel on the AIS plotter view, and call them with a tap of a button.

EASY TO UPDATE
Configure the radio, program the MMSI number, and get over-the-air software updates with the ActiveCaptain® smartphone app via built-in Wi-Fi® connectivity.

INSTALLATION IS A BREEZE
Installation is simple since VHF/DSC/AIS features only require a single VHF antenna and the GPS antenna/receiver is built into the unit. Chartplotter integration is seamless via the NMEA 2000® network and Garmin BlueNet™ Network.
ADVANCED SOFTWARE FEATURES
ADAPTIVE NOISE CANCELLATION
Advanced noise cancellation uses machine learning algorithms to eliminate wind, wave and engine noise for our cleanest audio experience.
AUTOMATED SQUELCH
Radio activity is constantly monitored to eliminate unnecessary noise and static. You also have the option for manual fine-tuning.
ADVANCED WATCH MODES
All VHF channels are continuously scanned for activity in the background, allowing you to maintain watch over channel 16 and all your favorite preset channels simultaneously.
VHF AUDIO PLAYBACK
Didn’t catch that message? Replay it with VHF audio playback, and listen to audio messages for up to 3 minutes on any channel.
YOUR OFFSHORE CONNECTION
COMMUNICATE
AIS TRANSPONDER
Maintain situational awareness with the built-in Class B AIS SOTDMA transponder.
FIST MIC
The included fist mic features a built-in speaker (5-watt RMS) and can be mounted in a different location to the head unit.
RUGGED DESIGN
The radio is built to withstand harsh marine environments with an IPX-7 rating.
EXTERNAL SPEAKER SUPPORT
Connect a compatible external speaker for more playback options beyond the built-in speaker on the fist mic.
HAILER WITH LISTEN BACK
Connect the radio to a compatible loudhailer for broadcasting announcements. The listen back feature gathers background sounds that can be heard through the fist mic or external speaker.
Specs
General |
|
| Unit size | Head Unit: 75 x 160 x 104 mm (3.0″ x 6.3″ x 4.1″) Fist Mic: 100 x 60 x 31 mm (3.9″ x 2.4″ x 1.2″) |
|---|---|
| Weight |
Head Unit: 655 g (1.45 lbs) |
| Operating voltage | 9.6 – 32 VDC |
| Water rating | IPX7 |
| Display Type | color IPS LCD, capacitive touch |
| Display Size | 3.5″ (89 mm) |
| Display resolution | 640 x 480 pixels |
| Operating temperature | –20° to 55° C (–4° to 131° F) |
| Inland waterways (ATIS) | |
| Backlight | 1,000 nits |
| Multi-language interface | |
VHF Features |
|
| Adaptive noise cancellation | |
|---|---|
| Audio record and playback | |
| Auto squelch | |
| Dual/Tri watch | |
| Presets watch | |
| NOAA weather alert | |
| NOAA weather watch | |
| Loud hailer | |
| Loudhailer listen back | |
| Intercom support | |
| AIS target display | |
| AIS collision and MOB alarms | |
| Integrated AIS transponder | |
VHF Radio |
|
| Region | All U.S., Canadian and International marine channels; NOAA weather channels |
|---|---|
| VHF frequency range Tx | 156.025–162.025 MHz |
| VHF frequency range Rx | 156.025–163.275 MHz |
| VHF transmit power (max) | 25 W, 1 W (high, low) |
| Transmitter frequency tolerance | +/0.3 kHz |
| Adjacent channel power | more than 70 dB |
| Spurious emissions | Less than –80 dBc (at 25 W) |
| Sensitivity (12 dB SINAD) | -118 dBm (-11 dBu/0.28 uV) |
| Adjacent channel selectivity | 80 dB |
| Spurious response | more than 75 dB |
| VHF intermodulation | more than 75 dB |
| Max antenna gain | 6 dBi |
DSC |
|
| Class | Class D |
|---|---|
| Sensitivity (1% BER) | -117 dBm (-10 dBu/0.32 uV) |
| Adjacent channel selectivity | 80 dB |
| Spurious response | more than 75 dB |
| Intermodulation | more than 75 dB |
AIS Transponder Features |
|
| Remote station support | RM 100 (x5) |
|---|---|
AIS |
|
| Class | SOTDMA Class B |
|---|---|
| Long range position reports (Msg 27) | |
| Frequency range | 156.025 – 162.025 MHz |
| AIS power output | 5 W |
| AIS Sensitivity (20% PER) | -115 dBm (-8 dBu/0.4 uV) |
| Adjacent channel selectivity | 80 dB |
| Spurious response | more than 75 dB |
| Intermodulation | more than 65 dB |
GNSS |
|
| Integrated GNSS receiver | |
|---|---|
| Integrated GNSS antenna | |
| Constellations | GPS, GLONASS, BeiDou, Galilleo |
| Differential support | SBAS, AIS Msg 17 |
| Navigation rate | 10 Hz |
Sensors |
|
| NMEA 2000 Compatible | |
|---|---|
| Battery voltage | |
Audio |
|
| Max speaker output power | Fist Mic: 5 W RMS, < 1% THD |
|---|---|
| Max external speaker output power | 15 W RMS, < 1% THD, 4 Ω |
| Max hailer loudspeaker output power | 25 W RMS, < 1% THD, 4 Ω |
Tactical Features |
|
| Night vision mode | |
|---|---|
| Stealth Mode | |
Electrical Features |
|
| Typical current draw at 12 Vdc | Head Unit: 700 mA, 6 A max Fist Mic: 90 mA, 0.9 A max |
|---|---|
| Compass-safe distance | Head Unit: 70 cm (27.6″) Fist Mic: 40 cm (15.8″) |
Networking & Connections |
|
| Garmin Marine Network | GMN 1.0/2.0 |
|---|---|
| Wireless Connectivity |
Access point for mobile phones, 802.11b/g/n, integrated antenna |
| Wireless security | WPA2 Personal |
| External GNSS antenna connector | SMA |
| Ant connector | SO-239 (50 Ω) |
Engineering enhancements are ongoing and may not be reflected in the pictures, videos and specifications.




























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