The easy-to-read GNX 21 marine instrument has an inverted display with white or color digits on a black background that 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 21 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 21 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.

¹Color backlight is not visible in daylight.

Physical & Performance

Display Size

83 x 60 mm; 101.6 mm diagonal

(3.3” x 2.4”; 4.0” diagonal)

Dimension 110 x 115 x 30 mm (4.33" x 4.53" x 1.18")     
Voltage range 9-16 V (from NMEA 2000)
Waterproof IPX7
Weight 230 g (8 oz)
Mounting Options      Flat or Flush
Display Type Inverted LCD, monochrome



NMEA 0183 Compatible      Yes
Auto-on Yes
Temperature range From 5° to 158°F (from -15° to 70°C)     
Glass bonded display Yes
User Profiles Yes
NMEA 2000® certified Yes
Compass safe distance 209 mm (8.25 in.)
Power Consumption

0.35 W (day); 0.4 W (night)

SKU GAR.010-01142-10
Model # 010-01142-10
UPC/EAN 0753759120962
Brand Garmin
Shipping Weight 0.9500kg

Be The First To Review This Product!

Help other Outback Marine Australia Pty Ltd users shop smarter by writing reviews for products you have purchased.

Write a product review