Garmin GNX 20 Marine Instrument with 4-Inch Display for Sailboats and Powerboats

GNX 20 Marine Instrument with Standard Display - 4"

Marine Instrucment with Standard 4" LCD

• Large, easy-to-read black digits and graphs on a white or color background provides high contrast and high visibility; choose from 7 customizable backlight colors


• Glass-bonded display with anti-glare lens avoids fogging


• Fully customizable user profiles for sail or power boating to display most important marine and vessel data


• Low power consumption (25 mA) with 350 mW (no backlight)/400 mW (mid-level backlight)


• 5 display configurations plus gauge and graph mode to display depth, speed, wind and 50+ marine and boat parameters

The easy-to-read GNX 20 marine instrument display with black digits on a white or color background clearly shows depth, speed, wind and 50-plus marine and boat parameters. Its glass-bonded display with anti-glare lens coating provides excellent daytime and nighttime readability with high-contrast digits scalable up to 36 mm.

The GNX 20 is the first glass-bonded marine instrument with a combination of directly driven LCD segments and a dot-matrix field to display graphical information. Its low power consumption - (25 mA) with 350 mW (no backlight)/400 mW (mid-level backlight) - is perfect for use on sailboats, and provides a valuable instrument for cruising and fishing. Fully customizable user profiles display wind, depth and speed data. Plus, the GNX 20 includes an auto-scroll feature that rotates through data screens for hands-free operation. It can be installed with the included low profile flush mount or an optional flat mount for the ultimate glass helm solution and custom look for your boat.

Easy-to-Read Display

Unique high-contrast hybrid display features large, easy-to-read digits scalable up to 36 mm tall. Offers excellent clarity in direct sunlight, at dusk, or at night. The dot-matrix section can show additional details and/or graphical information.

Glass-Bonded Display

Glass-bonded display helps prevent fogging, and the anti-glare lens finish increases visibility.

Customizable Color Background

Choose from 7 different backlight colors, or even create a customized color, to achieve the screen that provides optimum readability for you.

Customizable User Profiles

Fully customizable user profiles allow you to choose from 5 available display configurations for sailboat or powerboat user-profiles: single, dual and triple function, plus gauge and graph mode to display wind, depth and speed data, or customize the pages to display the marine and boat data that is most important to you.

Auto Scroll

Set your display to automatically cycle between pages at a speed you set for convenient, hands-free operation.

Low Power Consumption

Perfect for sailors who want to sail for long intervals without having to run a motor or generator to charge batteries. The GNX 20 uses only 25 mA with 350 mW daytime usage, requiring no backlight and just 400 mW with a mid-level backlight setting at night.

NMEA 2000

Monitor more than 50 marine and boat parameters, including GPS speed, water depth and temperature, wind direction, and wind speed from the NMEA 2000 bus. You can also add a NMEA 0183 device using the optional 7-pin bare-wire power/data cable.

In The Box

• GNX 20


• Trim piece snap cover


• Protective cover


• Flush mount gasket and hardware


• NMEA 2000 T-connector


• NMEA 2000 drop cable


• Installation instructions


• Documentation

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

The Garmin GNX 20 Marine Instrument offers a clear, high-contrast 4-inch LCD display designed for easy readability in all lighting conditions. Its large, black digits and customizable backlight colors ensure optimal visibility during daytime and nighttime use. The glass-bonded display with anti-glare lens prevents fogging and minimizes glare, providing consistent clarity whether on the water or dockside. Ideal for both sailboats and powerboats, this instrument can be configured with up to five display modes, including gauge and graph views, to monitor vital parameters such as depth, speed, wind, and more than 50 other marine and vessel data points.

Designed for versatility, the GNX 20 supports fully customizable user profiles tailored to your specific boating needs. These profiles allow you to display critical information like water temperature, GPS speed, and wind direction in a preferred layout. The auto-scroll feature enables hands-free operation by cycling through different data screens at your preferred pace. Its low power consumption—just 25 mA with a daytime backlight—makes it suitable for long-term cruising or fishing without draining your boat’s batteries.

Connectivity options include NMEA 2000 support, enabling seamless data sharing with other marine electronics and sensors. The device can display over 50 parameters, such as water depth, temperature, and wind data, providing comprehensive situational awareness. Installation is straightforward with the included flush mount hardware and optional flat mount for a sleek, integrated look. The GNX 20 is an essential instrument for serious boaters seeking reliable, customizable, and energy-efficient marine data display.Features include a high-contrast hybrid display with scalable digits for excellent readability, a durable glass-bonded screen with anti-glare coating, customizable backlight colors, flexible user profiles for sail or powerboat applications, auto-scroll for hands-free operation, low power consumption suitable for extended use, and comprehensive NMEA 2000 compatibility for extensive marine data integration. Included accessories comprise mounting hardware, NMEA 2000 cables, protective cover, and detailed installation instructions, ensuring a smooth setup process.For further details and installation guidance, refer to the official Garmin owners manual available online.

Features:

• Large, high-contrast 4-inch LCD display with scalable digits up to 36 mm for excellent daytime and nighttime visibility

• Glass-bonded display with anti-glare lens prevents fogging and reduces glare for clear viewing in all conditions

• Customizable backlight with 7 preset colors and options for creating a personalized color background

• Supports up to five user-configurable display profiles for sail or powerboat, including gauge and graph modes

• Auto-scroll feature for hands-free cycling through data screens at user-defined speeds

• Low power consumption at 25 mA with 350 mW (no backlight) and 400 mW (mid-level backlight), ideal for long voyages

• NMEA 2000 compatibility for displaying over 50 marine parameters such as depth, wind, temperature, and GPS speed

• Easy installation with included flush mount hardware and optional flat mount for a sleek glass helm look

• Durable glass-bonded display with anti-glare coating enhances visibility in bright sunlight or low-light conditions

• Complete with mounting hardware, NMEA 2000 cables, protective cover, and comprehensive installation instructions