Garmin
Garmin GNX 21 Marine Instrument with Inverted Monochrome LCD 4 inch
£409.99
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010-01142-10
The Garmin GNX 21 is a 4-inch inverted-LCD marine instrument that displays depth, speed, wind and over 50 marine and boat parameters. Its glass-bonded display and very low power draw make it ideal for sailboats.
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Available for collection or delivery in ~2 days
Pickup available at Mercury Yacht Harbour
Usually ready in 2-4 days
Description
The Garmin GNX 21 is a 4-inch marine instrument with an inverted monochrome LCD, designed for sailors who value clarity and battery economy. Its glass-bonded display shows white or colour digits on a black background, with an anti-glare lens coating for excellent readability by day and night. Digits scale up to 36 mm, keeping depth, speed, wind and over 50 other marine and boat parameters legible at a glance. Power consumption is exceptionally low at just 25 mA (350 mW with no backlight), which makes the GNX 21 particularly well suited to sailboats. It draws both power and data from a NMEA 2000 network and shares the same rugged, fully-gasketed polycarbonate case as the GNX 20, rated to IPX7. The inverted LCD is best viewed at less than a 50-degree angle.
PRODUCT DETAILS
- High-contrast 4-inch inverted 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
- Very low power consumption (25 mA, 350 mW with no backlight), ideal for sailboats
- Draws both power and data from a NMEA 2000 network (LEN 3)
- Flush mounts with the included template and hardware (90 mm cutout)
- IPX7 fully-gasketed waterproof construction
- GNX 21 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 | Inverted 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 50 degrees (inverted 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) |
Electrical
| Power Consumption (no backlight) | 25 mA, 350 mW |
| NMEA 2000 Input Voltage | 9 to 16 Vdc |
| Unit Maximum Voltage | 32 Vdc |
| Power Usage | 1.35 W maximum |
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) |
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 21 and GNX 20?
Both share the same 4-inch chassis. The GNX 21 has an inverted monochrome LCD (best viewed at under 50 degrees); the GNX 20 has a standard monochrome LCD (best viewed at under 45 degrees).
How much power does the GNX 21 use?
Very little. Power consumption is around 25 mA, with 350 mW at no backlight, which makes it ideal for sailboats. It has a NMEA 2000 LEN of 3.
How is the GNX 21 powered?
It connects to a NMEA 2000 network, which supplies both power and data.
What size cutout does the GNX 21 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 21 waterproof?
Yes. It is rated to IEC 60529 IPX7 and withstands incidental immersion in up to 1 m of water for 30 minutes.
