I think there is confusion here, perhaps on my part. The PPI in "PPI scope" stands for "Plan Position Indicator". The PPI scope is associated with the (I thought) surface-search RADAR.
The three lines on the screen (that I have seen) were on the air-search RADAR. Or am I mixing too much SH1 with SH4?
The Air-search RADAR should only show strength and range, not vector.
The three lines are differenct range settings for the air-search radar (at least that is what I thought). Some one please correct me if I have this wrong....
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\"One ping to find them all,
One ping to link them;
One ping to promote them all,
and in the darkness sink them.\"
with apologies to J.R.R. Tolkien
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