Raymarine C90w, C140w manual Radar overview, Radar scanner power modes, Digital radar

9.1 Radar overview

Radar is used to provide information that can help you to track targets and measure distances and bearings.

Radio Detection And Ranging (RADAR) is used at sea to detect the presence of objects (known as ‘targets’) at a distance, and if they are moving, detect their speed.

Radar works by transmitting radio pulses, then detecting reflections of these pulses (echoes) from objects in the area and displaying the reflections as targets on your display.

Until you are familiar with interpreting the radar display, every opportunity should be taken to compare the radar screen patterns with visual targets, such as other boats, buoys and coastal structures. You should practise harbor and coastal navigation during daylight hours and in clear weather conditions.

Digital radar

Your multifunction display can be used with digital radar scanners.

Digital radar scanners provide a range of advantages over analog radar, making it easier to discern objects around your vessel.

Digital radar scanners provide:

•Improved target detection.

•Full-color image.

•Dual Range operation.

•SuperHD option. This effectively increases the transmitter power by a factor of at least two, and reduces the beamwidth by a similar amount.

Note: You must connect a SuperHD radar scanner in order to use the SuperHD option.

9.2 Radar scanner power modes

The radar scanner has a number of power modes.

The radar scanner icon in the databar indicates the power status of the radar scanner. The following is an explanation of each status:

Radar	Radar Status
Mode	Icon	Description of status
Transmit		Rotating icon, signifying that the scanner
(TX)		is on and transmitting. When SCANNER
		is set to ON, select this mode to activate
		the scanner. This is the usual mode of
		operation.
Standby		Static icon, indicating that the scanner is
(STBY)		on but not transmitting, and the antenna is
		not rotating. Antenna does not rotate, the
		scanner does not transmit and the radar
		data is removed from the screen. This is a
		power save mode used when radar is not
		needed for short time periods. When you
		return to transmit mode, the magnetron
		does not need to warm up. This is the
		default mode.
Off		Scanner powered off when radar not
		required, but display is in use for other
		applications, such as the chart. When
		selected, the system counts down. During
		this time you cannot re-power the scanner.
Timed		Scanner switches between on/transmitting,
Transmit		and standby mode. Scanner goes into
		power save mode when constant use of
		radar is not required.

100 C-Series Widescreen user reference