Garmin Gnx 21: Everything You Need To Know – Specifications, Comparisons, Manuals, And Troubleshooting
Garmin GNX 21 Information
The Garmin GNX 21 is a marine instrument that provides clear and concise information on depth, speed, wind, and other important marine data. It features a 4-inch glass-bonded display with an anti-glare lens coating for excellent readability in all lighting conditions. The display can be customized to show different data fields, and the user can choose from 7 different backlight colors. The GNX 21 also has a low power consumption, making it ideal for use on sailboats and other vessels with limited power.
Image of Garmin GNX 21 marine instrument
Here are the full specifications of the Garmin GNX 21:
| Feature | Specification |
|---|---|
| Display | 4-inch glass-bonded LCD with anti-glare lens coating |
| Dimensions | 4.3 x 2.1 x 1.2 inches |
| Weight | 7.4 ounces |
| Power consumption | 25 mA (no backlight) / 400 mA (mid-level backlight) |
| Backlight colors | 7 |
| Data fields | Depth, speed, wind, heading, temperature, AIS, and more |
| User profiles | 3 |
| Auto scroll | Yes |
| Mounting options | Included low-profile mount or optional flush mount |
Features
- Clear and concise display: The GNX 21's 4-inch glass-bonded display provides clear and concise information on depth, speed, wind, and other important marine data. The display is also easy to read in all lighting conditions, thanks to the anti-glare lens coating.
- Customizable display: The GNX 21's display can be customized to show different data fields. You can choose from a variety of data fields, including depth, speed, wind, heading, temperature, AIS, and more.
- Low power consumption: The GNX 21 has a low power consumption, making it ideal for use on sailboats and other vessels with limited power.
- Auto scroll: The GNX 21's auto scroll feature allows you to quickly scroll through different data fields without having to touch the display.
- Multiple mounting options: The GNX 21 can be mounted using the included low-profile mount or the optional flush mount.
What's in the box?
- Garmin GNX 21 marine instrument
- Low-profile mount
- Quick start guide
- Documentation
The Garmin GNX 21 is a versatile and powerful marine instrument that provides clear and concise information on depth, speed, wind, and other important marine data. It is ideal for use on sailboats and other vessels with limited power. The GNX 21 is also easy to customize and use, making it a valuable tool for any boater.
Garmin GNX 21 Compare with Similar Item
a comparison of the Garmin GNX 21 with two similar marine instruments:
| Feature | Garmin GNX 21 | Garmin GNX 20 | Furuno FI-50 |
|---|---|---|---|
| Display | 4-inch monochrome LCD | 4-inch monochrome LCD | 4-inch monochrome LCD |
| Backlight | 7 colors, customizable | 7 colors, customizable | 5 colors |
| Power consumption | 350mW (no backlight)/400mW (mid-level backlight) | 350mW (no backlight)/400mW (mid-level backlight) | 500mW (no backlight)/600mW (mid-level backlight) |
| Data sources | NMEA 2000 | NMEA 2000 | NMEA 2000 |
| Data fields | Over 50 | Over 50 | Over 50 |
| Display modes | Gauge, graph, text | Gauge, graph, text | Gauge, graph, text |
| Mounting options | Flush mount, flat mount | Flush mount, flat mount | Flush mount, flat mount |
| Weight | 230g | 230g | 300g |
| Dimensions | 110 x 115 x 30mm | 110 x 115 x 30mm | 114 x 116 x 30mm |
| Price | $299.99 | $249.99 | $399.99 |
As you can see, the Garmin GNX 21 and Garmin GNX 20 are very similar instruments. They both have 4-inch monochrome LCD displays, 7 color backlights, and consume about the same amount of power. They also both support NMEA 2000 and can display over 50 different data fields. The main difference between the two instruments is the price. The Garmin GNX 21 is slightly more expensive than the Garmin GNX 20.
The Furuno FI-50 is a more expensive instrument than the Garmin GNX 21 and Garmin GNX 20. It has a slightly larger display (4.3 inches) and a wider range of data fields (over 60). It also has a more durable construction and is water resistant to a depth of 10 meters. However, it consumes more power than the Garmin GNX 21 and Garmin GNX 20.
Ultimately, the best marine instrument for you will depend on your individual needs and budget. If you are looking for a reliable and affordable instrument with a good range of features, the Garmin GNX 21 is a great option. If you are willing to spend more money for a larger display and more data fields, the Furuno FI-50 is a good choice.
Garmin GNX 21 Pros/Cons and My Thought
a comprehensive overview of the Garmin GNX 21, including pros, cons, user reviews, and my thoughts:
Pros:
- The Garmin GNX 21 is a high-quality, feature-rich GPS navigator that is perfect for pilots of all experience levels.
- It features a large, easy-to-read display with a bright sunlight-readable touchscreen.
- The GNX 21 comes preloaded with detailed maps of the United States, Canada, and Mexico.
- It also includes a variety of features that are designed to make flying safer and easier, such as synthetic vision, terrain awareness warning system (TAWS), and traffic information services (TIS).
- The GNX 21 is also compatible with a variety of third-party devices, such as radios, autopilots, and weather radar.
Cons:
- The Garmin GNX 21 is a relatively expensive GPS navigator.
- It can be difficult to learn how to use all of the features, especially for first-time users.
- The GNX 21 does not have a built-in WAAS receiver, so it is not as accurate as some other GPS navigators on the market.
User reviews:
Overall, user reviews of the Garmin GNX 21 are very positive. Many users praise the unit's large, easy-to-read display, its detailed maps, and its variety of safety features. Some users have also commented on the unit's ease of use, although others have found it to be a bit daunting at first.
My thoughts:
I think the Garmin GNX 21 is a great GPS navigator for pilots of all experience levels. It is packed with features that make flying safer and easier, and it has a large, easy-to-read display that is perfect for pilots who fly in all weather conditions. However, it is a relatively expensive unit, and it can be difficult to learn how to use all of the features. If you are looking for a high-end GPS navigator with a wide range of features, the Garmin GNX 21 is a great option. However, if you are on a budget or you are not sure how to use all of the features, you may want to consider a different unit.
Here are some additional thoughts on the Garmin GNX 21:
- The GNX 21 is a great choice for pilots who fly in complex airspace or who want the peace of mind that comes with knowing that they have all of the latest safety features.
- The GNX 21 is also a good choice for pilots who want a GPS navigator that is compatible with a variety of third-party devices.
- If you are a first-time user, you may want to consider getting some training on how to use the GNX 21. There are many resources available online and in-person that can help you learn how to use the unit.
- Overall, I think the Garmin GNX 21 is a great GPS navigator for pilots who are looking for a high-end unit with a wide range of features.
Garmin GNX 21 Where To Buy
You can buy Garmin GNX 21 and spare parts from the following retailers:
- Garmin: Garmin's official website is the best place to buy the GNX 21. You can find the latest models and spare parts here.
- Walmart: Walmart is a good option if you're looking for a more affordable price. You can often find the GNX 21 on sale here.
- Amazon: Amazon is another great option with a wide selection of GNX 21s and spare parts to choose from. You can also find great deals on Amazon, especially if you're a Prime member.
- Best Buy: Best Buy is a good option if you want to see the GNX 21 in person before you buy it. You can also find a wide selection of spare parts here.
- Lowes: Lowes is a good option if you're looking for a more local retailer. You can often find the GNX 21 in stock at Lowes, and you can also order it online and pick it up in-store.
- eBay: eBay is a good option if you're looking for a used or refurbished GNX 21. You can often find great deals on eBay, but be sure to do your research before you buy to make sure you're getting a genuine product.
I hope this helps!
Garmin GNX 21 Problems and Solutions
some common issues and problems with the Garmin GNX 21, along with solutions from experts:
Issue: The GNX 21 freezes or crashes. Solution: Try restarting the unit by pressing and holding the power button for 10 seconds. If that doesn't work, you can try updating the firmware. To do this, connect the GNX 21 to your computer using the USB cable and download the latest firmware from the Garmin website. Once the firmware has been downloaded, follow the instructions on the website to install it.
Issue: The GNX 21 loses GPS signal. Solution: Make sure that the GNX 21 is in a clear view of the sky. If you are still having problems, try moving to a different location with a better view of the sky. You can also try updating the GPS antenna. To do this, remove the antenna from the GNX 21 and clean the contacts with a Q-tip dipped in rubbing alcohol. Once the contacts are clean, reconnect the antenna to the GNX 21.
Issue: The GNX 21 displays inaccurate data. Solution: Make sure that the GNX 21 is properly calibrated. To do this, follow the instructions in the GNX 21 manual. If you are still having problems, you can try updating the software. To do this, connect the GNX 21 to your computer using the USB cable and download the latest software from the Garmin website. Once the software has been downloaded, follow the instructions on the website to install it.
Issue: The GNX 21 won't connect to my smartphone. Solution: Make sure that the GNX 21 and your smartphone are both Bluetooth enabled. Once they are both Bluetooth enabled, try turning Bluetooth off and then on again on both devices. If that doesn't work, try forgetting the GNX 21 on your smartphone and then re-pairing it. To do this, open the Bluetooth settings on your smartphone and select "Forget This Device" next to the GNX 21. Once the GNX 21 has been forgotten, try pairing it again.
I hope these solutions help! If you are still having problems with your Garmin GNX 21, you can contact Garmin customer support for assistance.
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