Garmin GMI20 Color Instrument Display — a versatile NMEA 2000-compatible marine instrument designed for both power and sail vessels. It clearly presents depth, speed, wind, and 100+ marine and vessel parameters on a large, bright 4" color display for effortless reading on deck or in the cockpit.

The GMI20 features a glass-bonded finish lens with anti-glare protection, delivering exceptional contrast and fog resistance. Its large digits and wide 170° viewing angle ensure information remains readable from across the helm, whether you’re under bright sun or low-light conditions.

Key features

• Large 4" color display with extra-large digits for easy viewing at a distance
• Depth, speed, wind and 100+ marine/vessel parameters at a glance
• Glass-bonded lens prevents fogging and enhances contrast
• Daylight readability via high-contrast color options; enhanced night readability with backlight dimmer and multiple color schemes (red/black, green/black, or standard night mode)
• Auto-scroll screens to cycle between pages automatically for versatile installation
• Customizable profiles for powerboat, sailboat, fishing, engine/fuel, and more
• NMEA 2000 power supply and easy integration into vessel networks
• Dedicated race timer counts down and counts up with an internal beeper
• Mounting versatility includes two trim snap cover options to match Garmin chartplotters

Smart design and versatility

The GMI20 is built for marine environments with a polycarbonate, IPX7-rated case and compact footprint. It’s optimized for both cockpit layouts and tight installations, allowing you to place the display in locations that suit your helm without sacrificing readability or data access.

Technical specifications

• Power: 2.5 W max; Unit max voltage 32 Vdc; NMEA 2000 input voltage 9–16 Vdc
• LEN (NMEA 2000 Load Equivalency Number): 6 (300 mA at 9 Vdc)
• Dimensions without sun cover: 110 x 115 x 30 mm (4.33" x 4.53" x 1.18"); with sun cover: 115 x 120 x 35.5 mm (4.53" x 4.72" x 1.40")
• Weight without sun cover: 247 g (8.71 oz); with sun cover: 283 g (9.98 oz)
• Temperature range: 5 to 158 °F (−15 to 70 °C)
• Compass-safe distance: 209 mm (8.25")
• Case: Polycarbonate, waterproof to IPX7

In the box

• GMI™ 20
• Black trim piece snap cover
• Silver/black trim piece snap cover
• Protective cover
• Flush mount gasket and hardware
• NMEA 2000 power cable
• NMEA 2000 drop cable
• NMEA 2000 T-connectors and terminators
• Documentation

Upgrade your nautical dashboard with the Garmin GMI20, a high-clarity instrument display that keeps your essential data front and center—day or night—while offering flexible installation, smart profiles, and reliable NMEA 2000 networking for seamless marine monitoring.