Radar/Chart Radar User Guide
Targets
65900010 10-15
Echo Reference Target
Echo reference is a method for generating a ground stabilised own ship’s
velocity by using a tracked target that is known to be stationary as a
reference point.
Any tracked target can be selected as an echo reference, providing the
target is established (i.e. has a vector), has not been declared lost, and AIS
input is off. Once selected its velocity is assumed to be zero and own ship's
speed is calculated on this assumption.
WARNING!
ECHO REFERENCE TARGETS MUST ONLY BE USED FOR THE
CALCULATION OF TRUE SPEED. USING REFERENCE TARGETS
TO CALCULATE RELATIVE SPEED CAN BE DANGEROUS. IT IS
RECOMMENDED THAT AN ALTERNATIVE SPEED SENSOR IS
SELECTED FOR COLLISION AVOIDANCE PURPOSES.
THE LOSS OF AN ECHO REFERENCE TARGET MAY HAVE A
MAJOR IMPACT ON THE ACCURACY OF THE TRUE SPEED AND
TRUE COURSE VALUES OF TRACKED TARGETS. THE VALUES
FOR OWN SHIP’S SPEED WILL ALSO BE DEGRADED.
When a target has been selected as an echo reference, own ship’s velocity
source is automatically selected to be ground based using the echo
reference generated velocity.
Only one target can be designated as the echo reference target at any one
time.
Summary of Contents for VisionMaster FT
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