Kongsberg Simrad RA83 Instruction Manual page 117

Chapter 6 RA83/84/85/93/94/95 Series
Using The Menu Operation Manual
Dangerous Target
If predicted CPA and TCPA values of an Activated Target are smaller than the one
being set up, the AIS target symbol will turn to a flashing bold symbol as shown below.
Figure 6.12 Alarm Target Symbol
Lost Target
A target that strays out of tracking is termed "Lost Target." The lost symbol is
displayed flashing with a line drawn across. When an activated target changes to a
lost target, the buzzer sounds. When a sleeping target changes to a lost target, the
buzzer does not sound and the symbol will disappear automatically approx. 1 minute
later.
Figure 6.13 Lost Target Symbol
NOTE:
The radar vector (generated by EPA or ATA) and the AIS vector may differ in terms of
the vector length and its direction. This is not a fault. The radar vector is developed
based on the past target positions stored either by manual plotting (EPA) or automatic
tracking (ATA). Meanwhile, the AIS vector is generated from the navigation data sent
from the AIS transponder. The radar vectors take a certain time until they are fully
displayed, while the AIS vector is displayed as soon as the AIS data is received from
the AIS transponder.
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