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 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 Selective Availability
(SA) and 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.
Specifications
- Signal/Data Processing
- Frequency:
283.5--325 KHz
- Demodulation:
MSK (Minimum Shift Keying)
- MSK Bit Rates:
25, 50, 100, 200. Selectable at the GPS receiver
- Data Format:
RTCM 104 version 2.0, RS-232, 6 of 8 format, 4800/9600 baud
- Remote Tuning:
Via auxiliary page menu on Garmin® marine GPS receivers
- Antenna Requirements
- Rec. Antenna:
18" stainless antenna (included)
- Antenna Coupler:
1.6" base diameter, .6" top diameter, 4.8" height
- Coupler Cable: 30'
RG-58 coaxial
- Power/Physical Specifications
- The Garmin GBR 21 is controlled from an on/off
power switch (not included). The receiver may be mounted remotely, but
a location that allows easy viewing of the LED status light is recommended.
- Size: 5.2"L
x 3.6"W x 1.5"H (13.2 x 9.1 x 3.8 cm)
- Weight: 6.8
ounces (193g)
- Voltage: 10-18vDC
- Current Draw:
130 ma
- LED Status Indicator
- Off: Power
to receiver off
- Flashing: Power
to receiver o
- Constant:
Power on, receiving data
Specifications are subject to change without notice.
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