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Garmin GBR 21 - page 1
owner’ s manual and refer ence guide GBR 21 beacon receiver © 1993-2000 GARMIN Corporation GARMIN International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U.S.A. 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 , T aipei County , T ...
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Garmin GBR 21 - page 2
© 1993-2000 GARMIN Corporation GARMIN International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U.S.A. T el. 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. T el. 44/1794.519944 Fax 44/1794.519222 GARMIN (Asia) Corporation No. 68, Jangshu 2nd R ...
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Garmin GBR 21 - page 3
1 Introduction Limited W arranty GARMIN Corporation warrants this product to be free fr om defects in materials and workmanship for one year from the date of pur chase. 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 char ge to the customer for parts or labor ...
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Garmin GBR 21 - page 4
2 Introduction Cautions All differ ential beacon receivers decode corr ection 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 Guar d (or s ...
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Garmin GBR 21 - page 5
3 Introduction T able of Contents Introduction Limited W arranty ........................................................1 Cautions .....................................................................2 T able of Contents .......................................................3 List of Figures ....................................................... ...
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Garmin GBR 21 - page 6
4 Installation Figure 1: Mounting the Receiver ............................................page 6 Figure 2: GBR 21 Cable Connections ............................................7 Scr een Example: GPS 12/12XL/48 Main Menu.............................8 Scr een Example: GPS 12/12XL/48 Input/Output Settings.............8 Scr een Example: GPS 12/12XL/48 ...
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Garmin GBR 21 - page 7
5 Capabilities The GBR 21 offers a host of powerful capabilities to enhance the performance and accuracy of your GARMIN GPS receiver: • Perfor mance— Single channel operation provides high-sensitivity manual tuning throughout the beacon br oadcast band. • Ease of Use— Operation is controlled using the Beacon Receiver Setup and Beacon Log pa ...
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Garmin GBR 21 - page 8
6 Mounting the Receiver Please r ead through these instructions thoroughly befor e attempting installation. Make sur e you completely understand these instructions befor e you begin. When in doubt, seek pr ofessional assistance. The receiver may be mounted at a remote location, under the dash or behind a panel. However , you may wish to mount the r ...
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Garmin GBR 21 - page 9
7 If a problem is found, try altering the location of the unit or wiring. Often moving the antenna a few feet away fr om the source of interfer ence will solve the problem. 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 pr ...
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Garmin GBR 21 - page 10
8 Mounting the Antenna The supplied antenna coupler fits a standard 1-inch antenna mount (not included). Like the receiver , the antenna should be placed away from all sour ces of interference. As a general rule, mount the antenna at least three feet fr om all other antennas and the vessel’ s electrical system components (alternator/ignition syst ...
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Garmin GBR 21 - page 11
9 Connecting the GBR 21 T o Y our GPS Unit The final step in installing the GBR 21 is to connect the receiver’ s DA T A IN, DA T A 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 ...
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Garmin GBR 21 - page 12
10 Installation Connecting GBR and GPS Figure 3: Sample Wiring to GARMIN GPS Units GBR 21 10-18 VDC UNITS WITH 6 PIN PLUG JUMPER THESE TOGETHER FOR 9600 BAUD. LEA VE THESE UNCONNECTED FOR 4800 BAUD. GBR 21 10-18 VDC (7) YELLOW : GROUND (6) GREEN: BAUD SELECT OUT (5) WHITE: BAUD SELECT IN JUMPER THESE TOGETHER FOR 9600 BAUD. LEA VE THESE UNCONNECTED ...
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Garmin GBR 21 - page 13
11 GBR 21 10-18 VDC (7) YELLOW : GROUND (6) GREEN: BAUD SELECT OUT (5) WHITE: BAUD SELECT IN JUMPER THESE TOGETHER FOR 9600 BAUD. LEA VE THESE UNCONNECTED FOR 4800 BAUD. UNITS WITH 18 PIN PLUG GBR 21 10-18 VDC JUMPER THESE TOGETHER FOR 9600 BAUD. LEA VE THESE UNCONNECTED FOR 4800 BAUD. UNITS WITH 4 PIN, RECTANGLE PLUG (1) RED: 10-18 VDC (2) BLACK: ...
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Garmin GBR 21 - page 14
12 autopilot or plotter , are connected to the GPS unit, they must be set to work with NMEA 0183 as well. (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 u ...
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Garmin GBR 21 - page 15
13 automatically default to the last beacon transmitter used each time the GPS unit is turned on.) 9. Select the Satellite Bar Graph P age. 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 . T h ...
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Garmin GBR 21 - page 16
14 The Main Menu Page on the GPS III/III+/12Map/ Navtalk. Select ‘Setup’ to make the desir ed inter face settings. Fr om the Interface Page, select ‘R TCM/NMEA ’ to pr operly interface with the GBR 21. DGPS: How It W orks The DGPS Beacon T ransmitter is placed at a known location (i.e., the exact position of the site has been previously det ...
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Garmin GBR 21 - page 17
15 • The range of a DGPS beacon transmitter (see the accompanying Beacon Reference Car d) is typically a few hundred miles, or less. Beyond this range, the beacon signal cannot be reliably r eceived. • Interference to the beacon signal can be experi- enced during periods of thunderstorm activity . Other sour ces of static interference, such as ...
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Garmin GBR 21 - page 18
16 Reference Sources of Error Multipath — Multipath error occurs when the GPS signal is reflected before it r eaches the GPS receiver . The reflected signal takes slightly longer to reach the GPS receiver than a non-reflected signal. This added time delay results in position err or . (The distance to each satellite is calculated based upon the ti ...
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Garmin GBR 21 - page 19
17 1) Receiver will not power on (No LED) Power switch/wiring faulty . Fuse/breaker blown (if used). Reference T roubleshooting Chart The r eceiver status indication at the top left of the Satellite Status Page will indicate ‘3D Diff’ or ‘2D Diff’ when differ ential corr ections are available. A ‘D’ appears at the bottom of the signal s ...
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Garmin GBR 21 - page 20
18 Reference T roubleshooting Chart If the ‘No Differ ential GPS Position’ message is displayed on your GPS r eceiver , corr ection data may not be available. This may be due to a missing or weak beacon signal, not enough GPS satellites or bad wiring connection between the GBR 21 and GPS. 8) Beacon signal weak or not received. Antenna coupler n ...
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Garmin GBR 21 - page 21
19 Reference Physical Size: 5.2”L x 3.6”W x 1.5”H (132mm x 91mm x 38mm) W eight: 6.8 ounces (0.193 kg) Power V oltage: 10 - 18 volts DC using supplied power/data cable Current Dr ain: 130 mA Signal Processing Frequency Range: 283.5 - 325.0 kHz Minimum Signal: 10 µV Acquisition Time: 15 seconds Data Processing Demodulation: MSK (Minimum Shift ...
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Garmin GBR 21 - page 22
20 A Antenna.............................................5, 7 Antenna coupler .................................5, 8 Antenna mount..................................6, 8 B Baud rate...............................................9 Beacon Log Page..................................12 Beacon Range.......................................15 Beacon Receiver ...
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Garmin GBR 21 - page 23
21 NOTES: Maximum Hole Diameter = 0.145" (3.68mm) Select fastener type/length per your installation. 3.359" (85.30mm) 4.752" (120.70mm) Reference Mounting T emplate T emplate ...
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Garmin GBR 21 - page 24
owner ’ s manual and r efe r ence guide GBR 21 beacon receiver © 1993-2000 GARMIN Corporation GARMIN Inte r national, Inc. 1200 East 151st St r eet, Olathe, Kansas 66062, U.S.A. GARMIN (Eu r ope) Ltd. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romse y , SO51 9AQ, U.K. GARMIN (Asia) Corporation No. 68, Jangshu 2nd Rd., Shij r , T aipei ...
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