Marine radome
From WikiCover
On December 28, 2007, Garmin announced improvements to its two most popular marine radomes -- the GMR 18 HD and GMR 24 HD -- providing better target separation and clearer definition, particularly at close ranges.
Both radomes also offer a full 4kW of transmit power. The GMR 18 HD features a 5-degree horizontal and 25-degree vertical beamwidth, which allow for accurate target acquisition and separation, and boasts a best-in-class range of 36 nautical miles (nm). The GMR 24 HD features an industry-leading 3.6-degree horizontal and 25-degree vertical beamwidth, and has a maximum effective range of 48 nautical miles. For navigating in tight quarters, skippers can switch the GMR 24 HD's rotation speed from 24 RPM to 30 RPM for rapid target updates. Like other Garmin radar, these new units process signals within the radome via a digital signal processor, and is dynamically presented on a Garmin Marine Network compatible chartplotter/multifunction display (MFDs). Digital processing allows for more precise recognition, enhancement, and filtering of radar echoes -- making the finished display easier to read and interpret.
With an optional heading sensor, the new unites support MARPA (Mini Automatic Radar Plotting Aid) collision avoidance capability, which allows boaters to track the course, speed, and predicted closest approach (by both time and distance) of multiple targets. A chart overlay capability allows boaters to reconcile radar signatures with known objects on the chartplotter. The screen can be split between standard radar presentations and radar overlay.
The GMR 18 HD and GMR 24 HD feature 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 units also boast selectable interference rejection, which mitigates the effect of nearby radar transmissions.
The radomes communicate with the Garmin Marine Network through a waterproof 100-megabit per second plug-and-play proprietary network -- which affords users the ability to expand their boat's system as needed.