Raymarine E90W, User Reference Handbook

Page: 116 / 250

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.
9.2 HD and SuperHD digital radar scan
speed
If your scanner supports multiple speeds, you can adjust the scan
speed.
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,
two options are provided for scanner speed:
• 24 RPM
• Auto
If your digital radar scanner only operates at 24 RPM, the scanner
speed option is disabled. Otherwise, you must select the Auto
option, which will automatically switch between the 24 RPM and 48
RPM scan speeds, as appropriate.
Selecting radar scanner speed
The speed option requires a 48 RPM compatible HD or SHD 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
116 E-Series Widescreen User reference