23. Common Reference System; Installation Of The System; Accuracy Of The System - Furuno FCR-2119-BB Operation Manual

23. COMMON REFERENCE SYSTEM

23.1

Installation of the System

Special attention of following topics is required to maintain the "Common Reference
System." The origin of the common reference system is the conning position on ves-
sel.
• The values of the center and conning positions depend on the size and geometry of
the ship.
• Offsets from the antenna position to the conning position of position sensors de-
pend on the location of the antennas of the position sensor.
• Offsets from the antenna position to the conning position of the radars depend on
the location of the radar antennas.
23.2

Accuracy of the System

Accuracy depends on the following conditions:
Gyro error referenced to chart orientation
Accuracy of EPFS
Accuracy of radar performance and display (see the specifications at the back of
this manual).
Accuracy of setting of CCRP (see section 2.32)
The following items must be properly adjusted to meet the above conditions:
Timing (Tx timing of radar echo). Timing is adjusted from the [RADAR INSTALLA-
TION] menu, accessible by a qualified technician. Contact a FURUNO dealer for
details.
Heading (Adjustment of radar echo heading). Heading is adjusted from the [RA-
DAR INSTALLATION] menu, accessible by a qualified technician. Contact a FU-
RUNO dealer for details.
Radar ANT position (Center of radar image is the radar antenna position). Radar
antenna position is set on the [Common Installation Settings] menu, accessible by
the qualified. Contact a FURUNO dealer for details.
Conning position:
• The chart radar uses position data fed from a GPS navigator to calculate the lat-
itude and longitude position of the conning position.
• GPS antenna position and conning position are entered during the installation.
GPS antenna and conning positions are set on the [Common Installation Set-
tings] menu, accessible by the qualified. Contact a FURUNO dealer for details.
• The latitude and longitude position displayed at the top-right position on the
screen is the latitude and longitude position of the conning position.
• The chart datum used by the chart radar is recorded in geodetic datum WGS-84;
therefore, the geodetic datum setting on the GPS navigator must be WGS-84.
23-1