Useful articles
Technical factors affecting the radar image
Although the radar can detect objects in darkness and fog, it cannot see everything beyond the horizon
Satellite compass - a device remote transmission rate (GPS based GNSS). Need to determine the direction, the location, speed and course in all weather conditions. The advantage of satellite compass is no effect on the characteristics of terrestrial magnetism, which allows to use the device on any vessel. As satellite compass is not required speed correction like a gyrocompass.