- Garmin GMR 21 Marine RADAR Antenna System
Package Includes:
- GMR 21
- Mount hardware kit
- Power/marine network cable (15 meters)
- Cable connector kit
- Cable holder
- Cable grommet
- Installation manual
- Owner's manual
See Targets, Not Your Radar
The GMR 21, along with the GMR 41, pack power, range, high-definition targeting, and plug-and-play connectivity in a space-saving 24-inch low-profile radome. The GMR 21, a sleek X-band digital color radar with a 24 nm range, features a narrow 3.6-degree horizontal and 25-degree vertical beamwidth for the clearest target definition in all weather conditions.
Digital Performance
Unlike competitive designs, which require a dedicated display/processor unit, all Garmin radar processing takes place in the radome ? via a digital signal processor. Data is presented on Garmin's Marine Network GPSMAP 3000 series chartplotter/multifunction displays (MFDs). The result: greater efficiency and redundancy, since any chartplotter on the network can display and control the radar. Digital processing also allows for more precise recognition, enhancement, and filtering of radar echoes ? making the finished display easier to read and interpret.
Easy to Use
The GMR 21 features automatic and manual sensitivity and tuning controls, including gain, sea clutter, and rain clutter ? which allows boaters to spend less time tuning the unit and more time navigating. The unit also boasts selectable interference rejection, which mitigates the effect of nearby radar transmissions.
Advanced Features
As an aid in locational awareness, GMR 21 radar images can be overlaid on your moving map chartplotter display. In addition, you can configure your display by splitting the screen to show overlay and standard radar simultaneously.
To aid in collision avoidance, the GMR 21 also offers Mini Automatic Radar Plotting Aid (MARPA) capability, which allows boaters to track the bearing, course, speed and predicted closest approach (by both time and distance) of up to 10 targets. MARPA functionality requires a GPSMAP 3000 series MFD and an optional heading sensor.
Plug-and-play Connectivity
The GMR 21 communicates with the Garmin Marine Network through a waterproof 100-megabit plug-and-play proprietary network ? which gives you the ability to expand your boat?s system as needed.
The Garmin Marine Network can provide vital situational awareness data like GPS, radar, sonar, and near real-time graphical weather data and audio channels directly on the GPSMAP 3000 series MFDs with a subscription to XM WX Satellite Weather and Radio. | 
