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3.3
Attention
Attention
3.3.23 Using Electronic Plot (EPA)
The EPA is used for a radar without the ATA function.
It stores and displays the target course and speed in the form of vector.
Up to 10 ships (plot No. 0 to 9) can be specified.
It also calculates the CPA and TCPA and outputs an alarm.
The plotting memory is cleared when the power is turned off.
The previous plot is not displayed.
3.3.23.1 Plotting Target
A vector is displayed by plotting a target twice.
The plot moves according to the course and speed calculated from the two plotted positions.
The plot can be modified.
The plot No. is not displayed when the plot No. display function is turned off.
Procedures
1. Put the cross cursor mark on the target and press the
ACQ
switch to
start the first plotting.
2. Enter the plot No. using a numeric key (
0
to
9
).
3. Press the
ENT
key to complete the first plotting.
The acquisition symbol ( ) and the plot No. are displayed at the plotting
position.
4. 30 seconds to 15 minutes after the first acquisition, put the cross cursor
mark at the position to which the target has been moved and start the
second plotting by following procedures 1 to 3 above. For the plot No.,
input the same one as the first plotting. After the second plotting is
completed, the symbol and plot No. displayed after the first plotting is
completed are cleared and a symbol (vector) and the plot No. are displayed
at the second plotting position.
5. The plot (symbol and plot No.) moves according to the fixed course and
speed calculated from the two plotting positions. In this status, the CPA
and TCPA at the moving position of the plot are calculated and an alarm
is output when the plot enters the alarm range.
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