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Questions and Answers (Q&As) |
Got a question about the Garmin GBR 21? Click this link to enter your question. No login required. Our tech staff moderates this Q&A and will typically respond within 24 hours (72 hours if a weekend). Visitors are also welcome to chime in at your convenience.
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Product Information |
| Manufacturer: |
Garmin |
Category: |
GPS Units |
Type: |
Marine GPS |
| Model: |
010-00068-00 |
SKU: |
21 |
UPC: |
753759000912 |
| Announced: |
November 30, 1999 |
First Shipped: |
August 20, 2001 |
Weight: |
3.300 lbs. |
Gallery of Customer Images |
| Customer submitted images of the Garmin GBR 21 in action. You can also view our entire gallery or add your own gallery item. Special limited time offer - get a free t-shirt with every approved submission with pictures. |
| » Garmin 421s in Flush Mount Kit |
 |  | | by Tim Rowsell on May 6, 2013 4,293 views
This is a new Garmin 421s installed using the Garmin flush mount kit. Install was easy any the final look is perfect! … (view more) |
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| » Honeymooning |
 |  | | by Chris K. on August 29, 2012 16,929 views
As part of preparation to travel a large portion of Ontario's Trent-Severn Waterway as our honeymoon trip, I ordered a Garmin GPSMap 421S with the Canadian BlueChart G2 charts. Being unfamiliar with the area, this chartplotter was worth every penny. Over seven … (view more) |
|
| » GPSMap 521 Screen Resolution |
 |  | | by Pascal Proulx on July 17, 2012 4,832 views
I bought this GPSMap 521 marine GPS to safely navigate unfamiliar rivers. I figured it cost way less than hitting the bottom and fix a damaged engine! It is also interesting to be able to quickly locate the most promising fishing spots. … (view more) |
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Customer Reviews |
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There are currently no reviews for the Garmin GBR 21.
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Family Series |
Garmin GBR 21 | 
Garmin GBR 23 | 
Garmin DGPS 53 | | | |
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Manufacturer Description |
Whether you're finding your way through the fog at a tricky harbor entrance or pinpointing a favorite fishing spot, the GBR 21 lets you get the most out of your receiver.
Developed in response to market demands for greater GPS accuracy, GARMIN's GBR 21 differential beacon receiver corrects for atmospheric error, enabling an accuracy of 5-10 meters. This small, remote-mounted, black box-style receiver links to all GARMIN differential-ready marine receivers and is in use only when turned on. The GBR 21 is waterproof, weighs less than 7 ounces, and measures only 5.2"L x 3.6"W x 1.5"H. All tuning and operating functions are controlled by the GPS unit while the GBR 21 is being used, including beacon receiver setup and beacon logging.
The GBR 21 uses the differential GPS corrections broadcast by the U.S. Coast Guard and the International Association of Lighthouse Authorities' beacons (283.5-325 KHz), which are supplied free of charge to mariners. These signals provide satellite status and pseudo-range information, in addition to the location and status of the beacon transmitter. The GBR 21 then decodes this information for use by a GARMIN GPS receiver, providing the improved repeatability and accuracy required for commercial applications and precision navigation.
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Features and Tips |
Here is a listing we have put together of some of the common GBR 21 features,
along with a few user tips that you may find of help for this particular item. | |
DIFFERENTIAL GPS (DGPS) EXPLAINED:
This unit is used to improve the accuracy of the position output of your GPS receiver by decoding the Coast Guard differential GPS corrections and sending them to your GPS receiver. All Garmin units are designed to be able to use these corrections. Accuracy improves to about 2 to 5 meters (7 to 16 feet).
The unit receives the coded transmissions which are broadcast free of charge by the US Coast Guard Differential Beacon Receiver Transmitters located throughout the USA and other parts of the world. You must be in range of a coast guard transmitter for the GBR 21 to work. A listing of locations of US Coast Guard transmitter sites can be found by clicking here. The US Coast Guard also provides a web page with a host of DGPS (differential GPS) information which you can reach by clicking here.
INSTALLATION:
These units come with a power/data cable which plugs into the GBR21 at one end and has bare pigtail wires at the other end. You are required to manually wire the power in to the unit and the data out to the receiving GPS unit. In most cases we recommend that you purchase the corresponding power/data cable for the host GPS receiver you are using as you will need it in order to complete all the wiring connections.
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Specifications |
There are no specifications currently available for this item. |
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