Reference Position - Furuno FCR-2107 Operator's Manual

2.30

Reference Position

The reference position for measurements (range, bearing, etc.) and markers (heading line, stern mark, etc.) can be
antenna position or consistent common reference point (CCRP), which is a location on own ship to which all
horizontal measurements, for example range, bearing, relative course, relative speed, closest point of approach
(CPA) or time to closest point of approach (TCPA), are normally referenced.
To select reference position, left-click the REF POINT indication at the top of the screen to select ANT or CCRP as
applicable.
The position of the own ship marker changes according to reference position as shown below. If the CCRP is
positioned outside of the effective display area, the bearing scale is indicated with the appropriate reduced detail.
Range and bearing are measured and graphics are drawn according to reference position as in the table below.
Category
Range and bearing
measurement
Graphics
Bearing cursor
Course, speed
CPA, TCPA
BCR, BCT
Own ship data
Markers, measurements and reference point
Item
EBL
VRM
Cursor
PI line
Range ring
Drop mark
Heading line
Stern mark
Beam line
Own ship vector
Own ship track
Heading
Speed
Course over ground
Speed over ground
Own L/L
Reference point
CCRP
Range and bearing Range and bearing
measured from CCRP measured from antenna
position
Drawn from CCRP Drawn from antenna
position
Drawn with CCRP at Drawn with antenna
center position at center
Calculated with Calculated with
CCRP at center antenna position at
center
Calculated with Calculated with
CCRP at center antenna position at
center
Calculated from bow position
Data from sensor, regardless of reference point
selected
15. Navigation Sensors
Antenna position
2-41