Garmin GNX™ 21 Marine Instrument


Garmin GNX™ 21 Marine Instrument

Part Number: 010-01142-10
GNX™ 21 Marine InstrumentGNX™ 21 Marine Instrument

Marine Instrument with Inverted 4” LCD

  • Large, easy-to-read white or color digits on a black background for high visibility in low-light or darkness; 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 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.


Unit dimensions (HxWxD): 11 cm x 11.5 cm x 3 cm

Display size (diagonal): 4.0" (10.16 cm)

Weight: 230 g (8 oz)

Temperature range: From 5° to 158°F (from -15° to 70°C)

Display type/color: Inverted LCD, monochrome

Maximum digit height: 36.4 mm

Glass-bonded display: Yes

Multiple color schemes: Yes

Sailboat, powerboat, customizable user-profiles: Yes

Power consumption: 0.35 W (day); 0.4 W (night)

NMEA 2000® and NMEA 0183 compatible: Yes

Single, dual and triple functions: Yes

Graphs: Yes

Flush/Flat mount capable: Yes