Garmin GPSMAP 421 4-Inch Waterproof Marine GPS and Chartplotter

Product Description

Edition: Base Model


The GPSMAP 421 is a compact chartplotter that features an ultra-bright 4 in (10.16 cm) QVGA color display along with an improved high-speed digital design for increased map drawing and panning speeds. It’s ready to go with a built-in, satellite-enhanced worldwide basemap and an easy-to-use interface designed to help you navigate the open waters with ease. The GPSMAP 421 also accepts BlueChart® g2 Vision® cards for added features and functionality such as high-resolution satellite imagery, 3-D views and Auto Guidance technology.


View Satellite-enhanced Worldwide Basemap


The GPSMAP 421 basemap contains worldwide satellite images in place of traditional maps. The GPSMAP 421 also comes standard with a high-sensitivity GPS receiver for superior satellite tracking and quicker acquisition times. In addition, the GPSMAP 421 can receive U.S. graphical weather data via optional GXM 51 satellite receiver/antenna. And with an SD™ card slot, it’s easy to add additional maps without connecting to a computer.


Add Extras with BlueChart g2 Vision


With the optional BlueChart g2 Vision SD card, you can add a whole new dimension of exceptional features to your chartplotter.




  • MarinerEye view and FishEye view provide you a 3-D perspective of map information, both above and below the waterline.


  • High-resolution satellite images and aerial photographs help you orient yourself in unfamiliar areas.


  • Auto Guidance technology searches through all relevant charts to create a route you can actually follow — one that avoids obstacles, shallow water, buoys and other obstructions.


What's in the Box:



  • GPSMAP 421

  • Tilt/swivel mount

  • Protective front cover

  • Power/data cable

  • Documentation

Garmin GPSMAP 421 4-Inch Waterproof Marine GPS and Chartplotter

Product Details

  • Product Dimensions: 12 x 9 x 6 inches ; 1.3 pounds
  • Shipping Weight: 9 pounds (View shipping rates and policies)
  • Shipping: Currently, item can be shipped only within the U.S.
  • ASIN: B002KMXZ9E
  • Item model number: 010-00764-00

Price : $360.36
You Save : $39.63 (10%)
Garmin GPSMAP 421 4-Inch Waterproof Marine GPS and Chartplotter

List Price : $399.99

Technical Details

  • Garmin GPSMAP 421 GPS Chartplotter
  • GARMIN GPSMAP 421 GPS CHART PLOTTER
  • Internal/External Antenna = Internal | Resolution (VxH) = 240 x 320 | Screen Size = 4.0/3.2x2.4 | Screen Type = Color
Garmin GPSMAP 421 4-Inch Waterproof Marine GPS and Chartplotter

Customer Reviews

If you are looking for a compact, user friendly GPS Chartplotter/Sounder; buy this one. Garmin is the best, most fairly priced plotter/sounders available. My only regret was not buying the 541s. That 1 inch make a difference. I've been on the water ny whole life and for the money the 441s and 541s are the best plotters available. Amazon has the best prices on them too. WOuld have recieved 5 stars but add and tech infor doesn't state how long the transducer wire is. I took a chance and it fit with some room to spare. Transducer wire is 25-30 ft long. I also recommend buying the transducer with speed and water temp.

Not bad just a little hard to set up the different screens on it.

But with nothing added right out of the box you can do quite a few things it has a tracking thing it has a speedometer and charts of where you are going and where you have been it has a chart plotter a man over board maker a track marker quite a lot and it does quite a bit without adding the transducer or antenna or any of the other add-on's it is easy to wire up to the boat there are a lot of wires when you open it up and it scared the crap out of me they were maybe 20 or 30 wires but do not worry you only need couple of them A Positive and a ground and thats pretty much it for the basic operation and like I said you really get a lot in my opinion..

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