The Garmin Signal VHF 400 is a premium fixed-mount marine VHF radio featuring a 3.5" colour touchscreen with edge-to-edge glass — an industry first. It is the top model in the Signal series, combining DSC distress calling, Class B AIS transponder (transmit and receive), integrated GPS, and advanced machine-learning noise cancellation in one compact helm unit. The built-in AIS transponder transmits your vessel's name, position, course and speed to nearby AIS-equipped vessels and displays range, course, speed and crossing situation of other vessels on screen. A single VHF antenna handles all VHF, DSC and AIS functions, minimising antenna runs. The GPS receiver is built into the unit — no external GPS sensor required. Background scanning continuously monitors all channels while you hold watch on Channel 16 and your preset favourites. VHF audio playback lets you replay missed transmissions for up to 3 minutes. Machine learning algorithms eliminate wind, wave and engine noise for the clearest audio experience on the market. Connects seamlessly to compatible chartplotters via NMEA 2000 and Garmin BlueNet. Supports the Garmin Signal RM 100 remote station for multi-station control from a secondary helm or flybridge. Supports 12V and 24V electrical systems.
Specifications
| Display | 3.5" colour touchscreen, edge-to-edge glass |
|---|---|
| AIS | Class B AIS Transponder (transmit + receive) — built-in |
| DSC | Class D DSC — built-in |
| GPS | Integrated GPS antenna/receiver (no external sensor required) |
| VHF Transmit Power | 25W / 1W selectable |
| Power Input | 12V or 24V DC |
| Dimensions (H × W × D) | 75 × 160 × 104 mm (3.0 × 6.3 × 4.1 in.) |
| Antenna | Single VHF antenna for VHF + DSC + AIS |
| Connectivity | NMEA 2000, Garmin BlueNet™ |
| Remote Station | Compatible with Garmin Signal RM 100 (sold separately) |
| Noise Cancellation | Advanced machine-learning (eliminates wind, wave, engine noise) |
| Background Scanning | Yes — all channels continuously scanned |
| VHF Audio Playback | Yes — replay missed transmissions up to 3 minutes on any channel |
| Intercom | Yes — between RM 100 remote station and networked head units |
| Waterproofing | IPX7 |
| Key Difference vs VHF 220 | AIS Transponder (transmit + receive) vs VHF 220's receive-only AIS |
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