Discontinued
This product has been discontinued by Garmin and is no longer available to buy.
Garmin
Garmin GNX 20 Marine Instrument with Standard Monochrome LCD 4 inch
010-01142-00
The Garmin GNX 20 is a 4-inch monochrome marine instrument that displays depth, speed, wind and over 50 marine and boat parameters. Its glass-bonded standard LCD offers high-contrast readability and connects to a NMEA 2000 network.
Description
The Garmin GNX 20 is a rugged 4-inch marine instrument built for sailors who want clear, glanceable data. Its high-contrast monochrome LCD shows white or colour digits on a black background, with an anti-glare glass lens that keeps readings sharp in bright daylight and at night. Digits scale up to 36 mm so depth, speed, wind and over 50 other marine and boat parameters stay legible from across the cockpit. The GNX 20 draws both power and data from a NMEA 2000 network and consumes just 1.35 W, making it well suited to sailboats where battery economy matters. The fully-gasketed polycarbonate case carries an IPX7 waterproof rating. It can also relay NMEA 0183 data to the network for other compatible Garmin instruments. The standard LCD is best viewed at less than a 45-degree angle.
PRODUCT DETAILS
- High-contrast 4-inch monochrome LCD with white or colour digits on a black background
- Glass-bonded display with anti-glare lens coating for excellent day and night readability
- Digits scalable up to 36 mm for easy reading at a distance
- Shows depth, speed, wind and 50-plus marine and boat parameters
- Draws both power and data from a NMEA 2000 network
- Low 1.35 W power draw (NMEA 2000 LEN 3), ideal for sailboats
- Flush mounts with the included template and hardware (90 mm cutout)
- IPX7 fully-gasketed waterproof construction
- GNX 20 marine instrument
- Sun cover
- Flush-mount gasket
- Flush-mount template
- Mounting hardware
- NMEA 2000 drop cable
- Documentation
No exploded diagram available for this product.
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No spares or accessories listed for this product.
No compatible products found.
Display
| Display Type | Standard monochrome LCD, glass-bonded with anti-glare lens coating |
| Display Size | 4 in (diagonal); digits scalable up to 36 mm |
| Recommended Viewing Angle | Less than 45 degrees (standard LCD) |
Connectivity
| Network | NMEA 2000 (powered and data via network) |
| NMEA 0183 | Receives NMEA 0183 from one device via optional data cable |
| NMEA 2000 LEN | 3 (150 mA at 9 Vdc) |
Physical
| Dimensions (without sun cover, H x W x D) | 110 x 115 x 30 mm (4.33 x 4.53 x 1.18 in) |
| Dimensions (with sun cover, H x W x D) | 115 x 120 x 35.5 mm (4.53 x 4.72 x 1.40 in) |
| Weight (without sun cover) | 247 g (8.71 oz) |
| Weight (with sun cover) | 283 g (9.98 oz) |
| Cutout | 90 mm (3.5 in) hole saw |
| Case Material | Fully-gasketed polycarbonate; glass lens with anti-glare finish |
| Compass-Safe Distance | 209 mm (8.25 in) |
Electrical
| NMEA 2000 Input Voltage | 9 to 16 Vdc |
| Unit Maximum Voltage | 32 Vdc |
| Power Usage | 1.35 W maximum |
Environmental
| Water Rating | IEC 60529 IPX7 (up to 1 m for 30 min) |
| Temperature Range | -15 to 70 C (5 to 158 F) |
No videos available for this product.
What is the difference between the GNX 20 and GNX 21?
Both share the same 4-inch chassis. The GNX 20 has a standard monochrome LCD (best viewed at under 45 degrees); the GNX 21 has an inverted monochrome LCD (best viewed at under 50 degrees).
How is the GNX 20 powered?
It connects to a NMEA 2000 network for both power and data, with a NMEA 2000 LEN of 3 and a maximum draw of 1.35 W.
How large are the digits on the GNX 20?
The high-contrast digits are scalable up to 36 mm, keeping data readable at a distance.
What size cutout does the GNX 20 need?
Flush mounting uses a 90 mm (3.5 in) hole saw with the included template and gasket. The unit measures 110 x 115 x 30 mm without the sun cover.
Is the GNX 20 waterproof?
Yes. It is rated to IEC 60529 IPX7 and withstands incidental immersion in up to 1 m of water for 30 minutes.
