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364 · ARPA Target functions
ARPA Target recording functions
Target recording is used to record ARPA targets information to danger targets log. For more information recording
of danger target, "Danger targets log" on page 386.
Using ARPA targets for chart align
Targets can be used to chart alignment. For more information, see chapter "How to use position alignment".
Using ARPA targets for position calculation
In the narrow water navigation, the radar is one of the best position sensors. The function Reference Target is
specially developed to use the radar as a position sensor.
The file containing Reference Targets must have at least 8 Reference targets inserted. The ARPA radar must be able
to track reliable simultaneously at least 2 Reference Targets before the position can be calculated.
When you start Reference Target positioning, Reference target field appears to Sensors Position sheet.
1. Start Reference target positioning.
2. Press Sensors button and open Position sheet.
3. Select Reference target as source of positioning
For position calculation select as primary or secondary source.
Using ARPA targets for gyro error correction
Reference Targets can be used for gyro error correction. For more information, see "Navigation parameters setting"
on page 399.
NOTE! The system is able to use Gyro error compensation value even if you have in Position sheet of Sensors dialog
box the Reference Targets in Off -position. The requirement for the Gyro error correction value is that you have
started the reference targets and the system has been able to calculate position and speed based on tracked reference
targets.