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GBR 21
beacon receiver
owner’s
manual
and
© 1993-2000 GARMIN Corporation
reference
GARMIN International, Inc.
1200 East 151st Street, Olathe, Kansas 66062, U.S.A.
guide
GARMIN (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K.
GARMIN (Asia) Corporation
No. 68, Jangshu 2nd Rd., Shijr, Taipei County, Taiwan
www.garmin.com
Part Number 190-00069-00 Rev. C
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© 1993-2000 GARMIN Corporation GARMIN International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U.S.A. Tel. 913/397.8200 or 800/800.1020 Fax 913/397.8282 GARMIN (Europe) Ltd. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K. Tel. 44/1794.519944 Fax 44/1794.519222 GARMIN (Asia) Corporation No. 68, Jangshu 2nd Rd., Shijr, Taipei County, Taiwan Tel. 886/02.2642.8999 Fax 886/02.2642.9099 All rights reserved. Except as expressly provided herein, no part of this man
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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 a
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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 govern- ment agency in other countries) which is responsible for their accuracy and maintenance. The Global Positioning System and the Differential
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Introduction Table of Contents Introduction Limited Warranty........................................................1 Cautions .....................................................................2 Table of Contents .......................................................3 List of Figures ............................................................4 Overview Capabilities & Package Contents................................5 Installation Mounting the Receiver ........................................
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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
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Overview Capabilities The GBR 21 offers a host of powerful capabilities to Capabilities & enhance the performance and accuracy of your GARMIN Package Contents GPS receiver: • Performance— Single channel operation provides The GBR 21 may be used with a high-sensitivity manual tuning throughout the variety of GARMIN GPS beacon broadcast band. receivers. The list below • Ease of Use— Operation is controlled using the identifies most, but not all, Beacon Receiver Setup and Beacon Log pages on compat
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Installation Mounting the Receiver Please read through these instructions thoroughly before Mounting the attempting installation. Make sure you completely understand Receiver 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 fol
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Installation If a problem is found, try altering the location of the unit or wiring. Often moving the antenna a few feet away Mounting the from the source of interference will solve the problem. Receiver When a suitable configuration is found, a permanent installation should be made. The GBR 21 may be mounted on any flat surface. Select the mounting location according to your preferences— either an out-of-the-way location (such as under the dash) or at an accessible location where the LED statu
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Installation Mounting the Antenna The supplied antenna coupler fits a standard 1-inch Mounting the antenna mount (not included). Like the receiver, the Antenna antenna should be placed away from all sources of interference. As a general rule, mount the antenna at least three feet from all other antennas and the vessel’s electrical system components (alternator/ignition system). Position the antenna so that the clearest view in all directions is obtained. The antenna coupler is supplied with 30 f
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Installation Connecting the GBR 21 To Your GPS Unit Connecting GBR and GPS The final step in installing the GBR 21 is to connect the receiver’s DATA IN, DATA OUT and GROUND (Return) lines to your GPS unit. The GBR 21 is designed to transmit/receive data at 4800 or 9600 baud (bits per second). The receiver defaults to 4800 baud, which is suitable for use with all GARMIN GPS receivers. The 9600 baud option is provided to allow the receiver to be used with some newer models and other manufacturer’s
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Installation Connecting GBR and GPS UNITS WITH 10-18 VDC 7 PIN PLUG GBR 21 (1) RED: POWER INPUT (1) RED: 10-18 VDC (2) BLACK: GROUND (2) BLACK: GROUND 4 3 (3) BLUE: DATA OUT (3) BLUE: DATA OUT 5 (4) BROWN: DATA IN (4) BROWN: DATA IN 2 (5) WHITE: NOT USED (5) WHITE: BAUD SELECT IN 6 (6) GREEN: NOT USED (6) GREEN: BAUD SELECT OUT 1 7 (7) YELLOW: ALARM (7) YELLOW : GROUND JUMPER THESE TOGETHER FOR 9600 BAUD. LEAVE THESE UNCONNECTED FOR 4800 BAUD. UNITS WITH 10-18 VDC
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Operation Using the GBR 21 UNITS WITH 10-18 VDC 18 PIN PLUG GBR 21 (15) RED: POWER INPUT (1) RED: 10-18 VDC 2 1 (18) BLACK: GROUND (2) BLACK: GROUND 3 (17) BLUE: DATA OUT (3) BLUE: DATA OUT 6 (4) BROWN: DATA IN (16) BROWN: DATA IN 11 7 (11) YELLOW: ALARM (5) WHITE: BAUD SELECT IN 15 12 (1-10,12-14) NOT USED (6) GREEN: BAUD SELECT OUT 18 16 (7) YELLOW : GROUND JUMPER THESE TOGETHER FOR 9600 BAUD. LEAVE THESE UNCONNECTED FOR 4800 BAUD. UNITS WITH 4 PIN, 10-18 VDC RECTA
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Operation autopilot or plotter, are connected to the GPS unit, they must be set to work with NMEA 0183 Using the as well. GBR 21 (Note: On some newer model Garmin GPS receivers, you may set the interface to “Garmin Bcn Rcvr”. There is also a scan option which will automatically scan for a DGPS frequency and bit rate. Please refer to your GPS owner’s manual for using this function. If this setting is used, you may skip step 4.) 4. From the Beacon Receiver Setup Page, enter the “Tuned To:” freque
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GPS SIGNAL CORRECTION DATA DGPS (CORRECTION) SIGNAL Reference automatically default to the last beacon transmitter used each time the GPS unit is turned DGPS: on.) How It Works 9. Select the Satellite Bar Graph Page. A “D” will appear at the bottom of the signal strength bar for each satellite with a corresponding differen- tial correction or “3D Differential” will be displayed at the top of the satellite page. This page is useful for determining the quality of differential coverage ava
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Reference The DGPS Beacon Transmitter is placed at a known location (i.e., the exact position of the site has been DGPS: previously determined). At the beacon transmitter site, How It Works the GPS satellites are monitored using a GPS receiver. This receiver is equipped to calculate corrections for each satellite received. The correction is the difference between the distance to the satellite (from the beacon site) as measured by the GPS receiver, and the actual distance to the satellite based
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Reference Individual stations vary and the user may wish to verify the suitability of the signal for the intended Sources of application with the station operator. The station power is Error normally set to provide a usable range somewhere near 300 km. Other factors such as local interference, lightning, time of day and season, and if the path to the station is over ground or water, and antenna selection or installation affect the usable signal range. Sources of Error Using a DGPS Beacon Receive
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Reference Multipath— Multipath error occurs when the GPS signal is reflected before it reaches the GPS receiver. The Sources of reflected signal takes slightly longer to reach the GPS Error receiver than a non-reflected signal. This added time delay results in position error. (The distance to each satellite is calculated based upon the time it takes the GPS signal to reach the GPS receiver.) Multipath error can be minimized by mounting the GPS antenna at a location which minimizes the potential
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Reference Troubleshooting Possible Cause Problem Chart 1) Receiver will not Power switch/wiring faulty. power on (No LED) Fuse/breaker blown (if used). 2) LED status light RTCM data not being received flashing from broadcast site. Wrong bit rate selected on GPS unit. Wrong frequency selected on GPS unit. GBR 21 not wired properly with GPS unit. Check wiring. Also refer to Troubleshooting problems 6 and 7. The receiver status indication 3) “No DGPS Position” Not enough data is available to at the
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Reference Problem Possible Cause Troubleshooting Chart Wrong frequency or bit rate 6) GPS interface selected on GPS unit. status screen displays “No data” or “No Antenna coupler not securely Signal” grounded. Check ground strap. Beacon transmitter not transmitting correction data. 7) GPS interface GBR 21 not wired properly with GPS unit. Check wiring. status screen displays “None”, “No Status” No power to GBR 21. See or “Check Wiring” Troubleshooting problem 1. Problem with DGPS antenna groundin
