Garmin GBR 21 User Manual

owner’s

manual

and

reference

guide

GBR 21

beacon receiver

© 1993-2000 GARMIN Corporation

GARMIN International, Inc.
1200 East 151st Street, Olathe, Kansas 66062, U.S.A.
Tel. [phone] or 800/800.1020
Fax [phone]

GARMIN (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K.
Tel. [phone]
Fax [phone]

GARMIN (Asia) Corporation
No. 68, Jangshu 2nd Rd., Shijr, Taipei County, Taiwan
Tel. [phone]
Fax [phone]

All rights reserved. Except as expressly provided herein, no part of this manual may
be reproduced, copied, transmitted, disseminated, downloaded or stored in any
storage medium, for any purpose without prior written consent of GARMIN
Corporation. GARMIN Corporation hereby grants permission to download a single
copy of this manual onto a hard drive or other electronic storage medium to be
viewed for personal use, provided that such electronic or printed copy of this
manual contains the complete text of this copyright notice and provided further that
any unauthorized commercial distribution of this manual is strictly prohibited.

Information in this manual is subject to change without notice. GARMIN
Corporation reserves the right to change or improve its products and to make
changes in the content without obligation to notify any person or organization of
such changes. Visit the GARMIN website for current updates and supplemental
information concerning the use and operation of this and other GARMIN products.

Website address: www.garmin.com

GARMIN and GBR 21 are registered trademarks of GARMIN Corporation and may
not be used without the express permission of GARMIN Corporation.

January 2000 Part Number 190-00069-00 Rev. C Printed in Taiwan

Introduction

Limited Warranty

GARMIN Corporation warrants this product to be free from defects in
materials and workmanship for one year from the date of purchase.
GARMIN will, at its sole option, repair or replace any components which
fail in normal use. Such repairs or replacement will be made at no charge to
the customer for parts or labor. The customer is, however, responsible for
any transportation costs. This warranty does not cover failures due to
abuse, misuse, accident or unauthorized alteration or repairs.

THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE
EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESSED
OR IMPLIED, INCLUDING ANY LIABILITY ARISING UNDER WAR­RANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU
SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE.

IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL,
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER
RESULTING FROM THE USE, MISUSE OR INABILITY TO USE THIS
PRODUCT OR FROM DEFECTS IN THE PRODUCT. SOME STATES DO
NOT ALLOW THE EXCLUSIONS OF INCIDENTAL OR CONSEQUEN­TIAL DAMAGES, SO THE ABOVE LIMITATIONS MAY NOT APPLY TO
YOU.

To obtain warranty service, call the GARMIN Customer Service
department (913/397.8200) for a returned merchandise authorization
number. The unit should be securely packaged with the tracking number
clearly marked on the outside of the package, and sent freight prepaid and
insured to a GARMIN warranty service station. A copy of the original sales
receipt is required as the proof of purchase for warranty repairs. GARMIN
retains the exclusive right to repair or replace the unit or software or offer a
full refund of the purchase price at its sole discretion. SUCH REMEDY
SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH
OF WARRANTY.

1

Introduction

Cautions

All differential beacon receivers decode correction data determined at
the beacon transmitter site via a GPS receiver(s). The GPS system is
operated by the government of the United States which is solely
responsible for their accuracy and maintenance. The DGPS beacon
transmitters are operated by the U.S. Coast Guard (or similar govern­ment agency in other countries) which is responsible for their accuracy
and maintenance. The Global Positioning System and the Differential
Global Positioning System are under development and are subject to
changes which could affect accuracy and performance of all DGPS
equipment. Although a DGPS system is a precision electronic
NAVigation AID (NAVAID), any NAVAID can be misused or misinter­preted, and therefore become unsafe. Use the DGPS system at your own
risk. To reduce this risk, carefully review and understand all aspects of
this Owner’s Manual and carefully compare indications from your GPS
receiver to all available navigation sources including the information
from other NAVAIDs, visual sightings, charts, etc. For safety, always
resolve any discrepancies before continuing navigation.

NOTE: This device complies with Part 15 of the FCC rules.
Operation of this device is subject to the following conditions: (1) This
device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause
undesired operation.

The GARMIN GBR 21 does not contain any user-serviceable parts.
Repairs should only be made by an authorized GARMIN service center.
Unauthorized repairs or modifications could void your warranty and
authority to operate this device under Part 15 regulations.

2

Introduction

Limited Warranty........................................................1

Cautions .....................................................................2

Table of Contents .......................................................3

List of Figures ............................................................4

Overview

Capabilities & Package Contents................................5

Installation

Mounting the Receiver ............................................6-7

Mounting the Antenna ...............................................8

Connecting GBR and GPS ....................................9-11

Introduction

Table of

Contents

Operation

Using the GBR 21 ...............................................11-13

Reference

DGPS: How It Works ..........................................13-14

Sources of Error ..................................................15-16

Troubleshooting Chart ........................................17-18

GBR 21 Specifications ..............................................19

Index ........................................................................20

Mounting Template .........................................................21

3

Introduction

List of

Figures

Installation

Figure 1: Mounting the Receiver............................................page 6

Figure 2: GBR 21 Cable Connections............................................7

Screen Example: GPS 12/12XL/48 Main Menu.............................8

Screen Example: GPS 12/12XL/48 Input/Output Settings.............8

Screen Example: GPS 12/12XL/48 Beacon Receiver Setup Page....9

Figure 3: Sample Wiring Diagram for GARMIN GPS units....10-11

Operation

Screen Example: GPSMAP Fixed Mount* Main Menu................12

Screen Example: GPSMAP Fixed Mount* Input/Output Page.....12

Reference

Figure 4: The DGPS System.........................................................13

Screen Example: GPSMAP Fixed Mount* Beacon Settings..........13

Figure 5: Shipboard DGPS System..............................................14

Screen Example: GPS Handheld** Main Menu...........................14

Screen Example: GPS Handheld** Interface Settings..................14

Screen Example: GPS Handheld** Beacon Settings....................15

Screen Example: GPS Handheld** Beacon Log Page...................15

Screen Example: Satellite Status Page.........................................17

Screen Example: “No Differential Position” Error.............................18

Mounting Template....................................................................21

*Screen examples apply to models 130/135/175/180/185/230/235
**Screen examples apply to models III/III+/12Map/NavTalk

4

Capabilities

The GBR 21 offers a host of powerful capabilities to
enhance the performance and accuracy of your GARMIN
GPS receiver:

Package Contents

• Performance— Single channel operation provides

high-sensitivity manual tuning throughout the
beacon broadcast band.

• Ease of Use— Operation is controlled using the

Beacon Receiver Setup and Beacon Log pages on
your GPS unit.

• Convenience— May be remotely mounted in an

out-of-the-way location. Receiver status informa­tion is displayed directly on the GPS unit.

• Low Power Consumption— Draws approxi-

mately 130 milliamps during normal operation.

• Interfaces — User-selectable operation for 4800 or

9600 baud.

• Accuracy— Improves position accuracy of GPS

unit to better than 10 meters (2 drms).

Package Contents

Your GARMIN GBR 21 package includes:

• GBR 21 unit

• Power/Data Cable

• Antenna coupler w/ 30’ cable & whip antenna

or GA 22/23 H-field beacon antenna w/ 30’ cable

The GBR 21 may be used with a
variety of GARMIN GPS
receivers. The list below
identifies most, but not all,
compatible models. If your GPS
receiver is not listed, you may
check with your GARMIN
dealer or contact GARMIN
product support at 1-800-800­1020 to verify compatibility.

•GPS II/II+/III/III+/III Pilot

•GPS eMap/eTrex/NavTalk

•GPS StreetPilot/ColorMap

•GPS 12/12XL/12CX/12Map

•GPS 38/40

•GPS 45/45XL/48

•GPS 50/75

•GPS 65

•GPS 89/90/92/95

•GPS 120/125

•GPSCOM 170/190

•GPSMAP 130/135/180/185

•GPSMAP 162/168

•GPSMAP 175/195/295

•GPSMAP 210/220/215/225

•GPSMAP 230/235

• Owner’s Manual

• Beacon Reference Card

This package provides the materials required to
permanently install the GBR 21 and connect it to your
GARMIN GPS unit. In addition to supplying power to the
GBR 21, the power/data cable is used to interface the GBR
21 to the GPS unit. The receiver may be powered by an
external 10-18 VDC power source. Power to the receiver
should be controlled by an on/off switch (not included),
such as an accessory switch on the control console.

Overview

Capabilities &

5

Installation

Mounting the

Receiver

Mounting the Receiver

Please read through these instructions thoroughly before
attempting installation. Make sure you completely understand
these instructions before you begin. When in doubt, seek
professional assistance.

The receiver may be mounted at a remote location,
under the dash or behind a panel. However, you may
wish to mount the receiver at a location that allows easy
viewing of the LED status light for immediate indication
of receiver status.

The following items are required to complete the
installation of your GBR 21:

• Antenna mount (standard 1-inch, 14 threads per

inch)

• Hardware (to secure the GBR 21)

• On/off switch (to control power to the GBR 21)

It is recommended that the system be temporarily
hooked up with the wiring and unit placement
approximating the desired final installation. Then check
operation with potential local interfering equipment
turned on and off. For example, other electronic
equipment, fan motors, engine ignition, alternators or
generators can be sources of interference.

INSTALLATION NOTES

Recommended Screw/Bolt Diameter: #4 or #6
Material: Stainless Steel
Length: Select per your installation

Locknuts or lockwashers are recommended.
Hardware shown is for example purposes only.

6

Figure 1: Mounting the Receiver