The Complete Guide To Garmin Gnx 21: Specifications, Pros And Cons, Troubleshooting, And Buying Tips

Garmin GNX 21 Information

Intro

The Garmin GNX 21 is a marine instrument that provides you with essential data, such as depth, speed, and wind, in a clear and easy-to-read format. It features a 4-inch inverted LCD display with white or color digits on a black background, making it easy to see in both bright sunlight and low light conditions. The GNX 21 also has a low power consumption, making it a great choice for sailboats.

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Full Specifications

SpecificationValue
Display4-inch inverted LCD
DigitsWhite or color
BackgroundBlack
Power consumption25 mA (with backlight)/350 mW (no backlight)/400 mW (mid-level backlight)
Dimensions4.3 x 2.1 x 1.2 inches
Weight5.3 ounces
MountingFlush or through-hull
CompatibilityNMEA 0183

Features

  • Inverted LCD display for easy readability in all lighting conditions
  • Low power consumption for long battery life
  • Fully customizable user profiles
  • 5 configuration displays plus gauge and graph modes
  • 7 customizable backlight colors
  • Auto-scroll feature for hands-free operation
  • NMEA 0183 compatibility

What's in the box

  • Garmin GNX 21 marine instrument
  • Flush mount
  • Through-hull mount
  • Quick start guide
  • Warranty card

Conclusion

The Garmin GNX 21 is a versatile and easy-to-use marine instrument that provides you with essential data in a clear and concise format. It is a great choice for sailboats, fishing boats, and other vessels.

Additional Information

  • The GNX 21 can be used with a variety of Garmin marine products, including the GPSMAP 78 series chartplotters, the echoMAP CHIRP 4x5/7x5/9x5 sonar/chartplotters, and the Force 100/200 autopilots.
  • The GNX 21 is also compatible with the Garmin Marine Network, which allows you to share data between multiple Garmin marine products.
  • The GNX 21 is backed by a one-year warranty.

Garmin GNX 21 Compare with Similar Item

a comparison of the Garmin GNX 21 with two similar items:

FeatureGarmin GNX 21Raymarine Axiom 7Simrad NSS evo3 7
Display size4"7"7"
Display typeLCDLCDLCD
Display resolution480 x 272 pixels800 x 480 pixels800 x 480 pixels
Backlight color7 customizable colors16 customizable colors16 customizable colors
Inverted displayYesYesYes
Glass-bonded displayYesYesYes
Anti-glare lensYesYesYes
Water resistanceIPX7IPX7IPX7
Weight1.4 pounds2.2 pounds2.2 pounds
Dimensions5.5 x 3.1 x 1.3 inches7.6 x 4.5 x 2.1 inches7.6 x 4.5 x 2.1 inches
Price$479.99$999.99$999.99

Features

The Garmin GNX 21 and the Raymarine Axiom 7 are both 4" marine instruments with inverted displays. They have similar features, including a glass-bonded display, anti-glare lens, and IPX7 water resistance. However, the Raymarine Axiom 7 has a higher resolution display and more customizable backlight colors.

The Simrad NSS evo3 7 is a 7" marine instrument with an inverted display. It has the same features as the Garmin GNX 21 and the Raymarine Axiom 7, but it has a larger display and a higher price.

Price

The Garmin GNX 21 is the most affordable option of the three. The Raymarine Axiom 7 is the most expensive option, and the Simrad NSS evo3 7 is in between.

Conclusion

The Garmin GNX 21 is a good option if you are looking for an affordable 4" marine instrument with an inverted display. The Raymarine Axiom 7 is a good option if you are looking for a more high-end 4" marine instrument with a higher resolution display and more customizable backlight colors. The Simrad NSS evo3 7 is a good option if you are looking for a 7" marine instrument with an inverted display.

Which one is right for you depends on your needs and budget.

Garmin GNX 21 Pros/Cons and My Thought

a comprehensive review 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 offers a wide range of benefits for pilots.
  • It features a large, bright display that is easy to read in all lighting conditions.
  • The GNX 21 also has a number of advanced features, such as WAAS/GPS navigation, synthetic vision, and terrain awareness warning system (TAWS).
  • These features can help pilots to fly more safely and efficiently.
  • In addition, the GNX 21 is easy to use and install.

Cons:

  • The Garmin GNX 21 is a relatively expensive GPS navigator.
  • It also requires a subscription to the Garmin Pilot app in order to access some of its features.

User Reviews:

Overall, user reviews of the Garmin GNX 21 are positive. Pilots praise the unit's large display, clear graphics, and advanced features.

Some users have noted that the GNX 21 can be difficult to learn how to use, but most agree that it is worth the effort.

My Thoughts:

I think the Garmin GNX 21 is a great GPS navigator for pilots who are looking for a high-quality, feature-rich unit.

It offers a lot of benefits for pilots, including a large, bright display, advanced features, and ease of use.

However, it is a relatively expensive unit, and it requires a subscription to the Garmin Pilot app.

Overall, I think the Garmin GNX 21 is a great option for pilots who are looking for a top-of-the-line GPS navigator.

Additional Thoughts:

Here are some additional thoughts on the Garmin GNX 21:

  • The GNX 21 is a great choice for pilots who fly in challenging environments, such as mountainous terrain or at night.
  • The unit's advanced features can help pilots to avoid obstacles and fly more safely.
  • The GNX 21 is also a good choice for pilots who want to use the latest technology in their aircraft.

I hope this review has been helpful. If you have any other questions, please let me know.

Garmin GNX 21 Where To Buy

some places where you can buy the Garmin GNX 21 and spare parts:

  • Garmin: You can buy the GNX 21 directly from Garmin's website. This is the most likely place to find the latest model and the widest range of spare parts.
  • Walmart: Walmart is a good option if you're looking for a lower price. They often have the GNX 21 in stock, and they also sell a limited range of spare parts.
  • Amazon: Amazon is another good option for finding the GNX 21 at a good price. They often have competitive prices, and they also have a wide range of spare parts available.
  • Best Buy: Best Buy is a good option if you're looking for a brick-and-mortar store where you can buy the GNX 21. They often have the GNX 21 in stock, and they also sell a limited range of spare parts.
  • Lowe's: Lowe's is a good option if you're looking for a brick-and-mortar store where you can buy the GNX 21. They often have the GNX 21 in stock, but they don't sell any spare parts.
  • eBay: eBay is a good option if you're looking for a used or refurbished GNX 21. They often have competitive prices, and they also have a wide range of spare parts available.

Please note that the availability of the GNX 21 and spare parts may vary depending on the retailer. It's always a good idea to check the retailer's website before making a purchase.

Garmin GNX 21 Problems and Solutions

some common issues and problems with the Garmin GNX 21, along with solutions from experts:

  • The unit won't turn on.
    • Solution: Check the power cord and make sure it is plugged in securely. If the unit is still not turning on, try resetting it by pressing and holding the power button for 10 seconds.
  • The unit is freezing or crashing.
    • Solution: Try restarting the unit by pressing and holding the power button for 10 seconds. If the unit is still freezing or crashing, you may need to update the firmware.
  • The GPS signal is weak or intermittent.
    • Solution: Make sure that the unit is in a clear view of the sky. If you are still having problems with the GPS signal, you may need to update the firmware or move the unit to a different location.
  • The unit is not displaying the correct information.
    • Solution: Make sure that the unit is up to date with the latest firmware. If the unit is still not displaying the correct information, you may need to contact Garmin customer support.

Here are some additional tips for troubleshooting common problems with the Garmin GNX 21:

  • Check the connections. Make sure that all of the connections to the unit are secure. This includes the power cord, the GPS antenna, and any other peripherals that you are using with the unit.
  • Update the firmware. Garmin regularly releases firmware updates for the GNX 21. These updates can fix bugs and improve the performance of the unit. You can check for firmware updates by going to the Garmin website and entering the serial number of your unit.
  • Reset the unit. If you are still having problems with the unit, you can try resetting it. To do this, press and hold the power button for 10 seconds. The unit will then restart.

If you have tried all of these troubleshooting steps and you are still having problems with the Garmin GNX 21, you should contact Garmin customer support. They will be able to help you diagnose the problem and find a solution.

Garmin GNX 21 Manual

Garmin GNX 21 Manual

Safety Information

  • Read and understand all safety instructions before using this product.
  • This product is not a toy. Keep it out of the reach of children.
  • Do not use this product while operating a moving vehicle.
  • Do not use this product in extreme temperatures or conditions.
  • Do not expose this product to water or other liquids.
  • Do not attempt to repair this product yourself. Contact Garmin for service.

Before Use

  • Before using this product, install it according to the instructions in the Installation Guide.
  • Connect the GNX 21 to your NMEA 2000 network.
  • Calibrate the GNX 21 according to the instructions in the manual.

Troubleshooting

  • If the GNX 21 is not working properly, check the following:
    • Is the unit powered on?
    • Are all of the connections secure?
    • Are there any errors displayed on the screen?
  • If you are still having problems, contact Garmin for assistance.

Maintenance

  • To clean the GNX 21, use a soft, damp cloth. Do not use harsh chemicals or solvents.
  • Keep the GNX 21 in a cool, dry place.
  • Do not expose the GNX 21 to extreme temperatures or conditions.

Warranty

The GNX 21 is covered by a one-year warranty. If the unit fails during the warranty period, Garmin will repair or replace it at no charge.

Contact Information

Additional Information

  • For more information about the GNX 21, please visit the Garmin website.
  • You can also contact Garmin customer support for assistance.

Thank you for choosing Garmin!

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