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2. RADAR, CHART RADAR OPERATION
2-45
Range and bearing are measured and graphics are drawn according to reference
point as shown in the table below.
Category Item
Reference point
CCRP Antenna position
Range and bear-
ing measurement
EBL Range and bearing
measured from
CCRP
Range and bearing
measured from an-
tenna position
VRM
Cursor
PI line
Range ring
Drop mark
Graphics Heading line Drawn from CCRP Drawn from antenna
position
Stern mark
Beam line
Own ship vector
Own ship track
Bearing cursor Drawn with CCRP at
center
Drawn with antenna
position at center
Course, speed Calculated with
CCRP at center
Calculated with an-
tenna position at
center
CPA, TCPA Calculated with
CCRP at center
Calculated with an-
tenna position at
center
BCR, BCT Calculated from bow position
Own ship data Heading Data from sensor, regardless of reference
point selected
Speed
Course over ground
Speed over ground
Own L/L