2.1 The electronic plotting aid should provide
a means to plot a minimum of 10 targets on a radar display.
2.2 It should be possible to plot targets on the
3, 6 and 12 nautical mile range scales. The facility may be provided
on additional range scales. Plots should be maintained when switching
between range scales.
2.3 It should be possible to plot targets with
a relative speed up to 75 knots.
2.4 It should be possible for the operator to
adjust the CPA/TCPA limits and the vector time.
2.5 Plot positions should be identified by an
approved symbol and an associated plot number. It should be possible
to switch off the plot number.
2.6 The minimum lapsed time between any two plots
should be greater than 30 s.
2.7 After the second plot, a vector should be
displayed on the target. It should be possible to select a true or
relative vector. There should be a positive indication of vector mode.
2.8 The vector origin should move across the screen
at a rate and direction defined by the calculated true course and
speed.
2.9 It should be possible to correct the position
of a plot.
2.10 It should be possible, on demand, to display
the following data on a selected target:
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.1 plot number: time since last plot (min)
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.2 present range of the target
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.3 present bearing of the target
-
.4 predicted target range at the closest point
of approach (CPA)
-
.5 predicted time to CPA (TCPA)
-
.6 calculated true course of target
-
.7 calculated true speed of target
The selected plot should be clearly identified with an approved
symbol and the plot data should be displayed outside of the screen
radar area.
2.11 There should be an indication of any plot
that is not updated for 10 min. The plot should be dropped if the
time between consecutive plots exceeds 15 min.