Beam angle is determined by the size of a radar antenna. Blinding rain can lead to low power radar performing less than it should. The higher the power of a radar, the better your transmitter can see through dense fog and rain, and the further the signal can reach. Power is a crucial factor in defining how well your radar performs in bad weather. The two fundamental features of a marine radar unit are transmitter power and beam angle. It helps in detecting boats, birds, landmasses, and weather systems - even if the visibility is less than usual. It does so by detecting other ships and land obstacles, to give bearing and distance for collision avoidance and navigation while on water.Ī marine radar device acts as a major navigation aid for boaters. When the signal hits an object, it gets reflected back to the radar, which can then calculate a rough estimate of the object. Marine Radar - Radio Detection and Ranging, is used to detect objects and their position relative to your current location.