The Garmin GMI 20 is a 4-inch color marine instrument display built for both power and sail vessels, capable of showing depth, speed, wind, and more than 100 additional marine and vessel parameters. A glass-bonded lens with anti-glare finish resists fogging and boosts contrast, while the 170-degree viewing angle and extra-large digits keep data readable from across the cockpit. Night modes in red/black, green/black, or standard color — paired with a dimmer control — support low-light use, and the auto-scroll function cycles pages hands-free, opening up flexible mounting locations. Default profiles for powerboat, sailboat, fishing, and engine/fuel are all user-customizable, and a built-in race timer with an internal beeper handles countdown and count-up duties. Two included trim snap covers let you match the unit to GPSMAP 500/700 series, GPSMAP 8000 Glass Helm series, or legacy Garmin chartplotters. Power is drawn directly from the NMEA 2000 network.

Specifications:

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

In the Box:

• GMI 20 marine instrument display
• Black trim piece snap cover
• Protective cover
• Flush mount gasket and hardware
• NMEA 2000 T-connector
• NMEA 2000 drop cable
• Documentation

Resources:

• Owner's Manual (PDF)
• Installation Guide (PDF)
• Quick Start Guide (PDF)

⚠️ California Prop 65 Warning: This product can expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to P65Warnings.ca.gov.