Radar Overview; Digital Radar Scan Speed - Raymarine E Series User Reference Handbook

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.
HD and SuperHD digital radar
Your multifunction display can be used with digital radar scanners.
HD and SuperHD Digital radar scanners provide a range of
advantages, making it easier to discern objects around your vessel.
HD and SuperHD 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 2, and reduces the beamwidth by a similar
amount.
Note: You must connect a SuperHD radar scanner in order to
use the SuperHD option.
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9.2 Digital radar scan speed

Certain digital radar scanners support multiple scan speeds.
Radar scan speed is set up using the Digital Scanner Setup Menu,
accessible from the Radar Setup menu. When the system detects a
scanner that is capable of operating at both 24 RPM and 48 RPM,
2 options are provided for scanner speed:
• 24 RPM
• Auto
If you have a digital radar scanner that only operates at 24 RPM,
the scanner speed option is disabled. If the scanner speed option
is enabled, you must select the Auto option if you want to use the
higher scan speeds. This option automatically switches between the
24 RPM and 48 RPM scan speeds as appropriate.
Selecting radar scanner speed
The speed option requires a 48 RPM compatible SuperHD digital
radar scanner.
Select your radar scanner speed from within the radar application.
1. Press the MENU button.
2. Select Radar Setup > Scanner Speed menu options.
3. Select the Scanner Speed menu item and the appropriate speed
setting:
• Auto
• 24 RPM
The Auto option automatically selects the appropriate speed
for your radar range. 48 RPM is used at radar ranges of up
to 3 nm. It provides an increased refresh rate, which is useful
at high speed or in areas where you have large numbers of
radar targets. At radar ranges of greater than 3 nm the display
switches the radar speed to 24 RPM.
E-Series Widescreen User reference