Raymarine LIGHTHOUSE 4, Operation Instructions Manual

Page: 298 / 504

The Color palettes can be selected from the Presentation tab: [Menu >
Settings > Presentation] .
Caution: Doppler limitations
When the target's speed is more than 60 knots Speed Over
Ground (SOG), or the relative speed between your vessel and
the target is greater than 120 knots, the direction of target
returns from high speed vessels may be displayed incorrectly.
Consequently,
the displayed target colors may be inverted,
with targets colored red when they should be green, and
vice versa.
Doppler data source requirements
Use of the Doppler Radar features requires the following data sources to be
available on your system (e.g. connected to your multifunction display, via
SeaTalkng ® or NMEA 0183).
Required data sources
Data type Example data source
COG (Course Over Ground) GPS or GNSS receiver (MFD internal
receiver or external receiver).
SOG (Speed Over Ground) GPS or GNSS receiver (MFD internal
receiver or external receiver).
Recommended data source
Data type Example data source
HDG / HDT (True Heading) Compass or Autopilot sensor providing
Fastheading data (e.g. Evolution EV-1 /
EV-2).
Note:
A heading data source is not essential for Doppler operation. However
it will improve the performance of Doppler mode at slower speeds (< 15
knots), when tide set and leeway are present.
20.14 Blank sectors
Blank sectors can be manually set to hide specific sections of your radar
display.
This feature is useful for vessels that experience false radar readings from
onboard structures or equipment.
As blanking also physically disables the scanner’s transmitter for the sector
that you define, this feature is also useful for protecting crew members from
radar radio frequency emissions when they are in close proximity to the
radar antenna. One example of this scenario is when the helm is within the
beamwidth of the radar antenna.
Note:
Sector blanking is only available with Cyclone solid state open array,
Magnum™ Open Array and Quantum™ 2 Doppler running Radar software
version 2.46 or above.
Blank sectors can be enabled from the Radar app settings: [Radar app >
Settings menu > Installation]
Two blank sectors can be enabled. You can edit the minimum and maximum
limits of each blank sector; this will determine how much of the radar display
is hidden.
298