On using the ghost icon, it must be remembered that this projected path is only reliable when the contact first appears on the map. As the contact gets older, it's no good anymore cause the ghost's postion is calculated from the time at present, not on the time the contact actually first appeared.
So, if you see a contact show up do the plotting at that time based on the ghost's projection, but after this the projection should be ignored as it's no longer valid.
Now the map contacts after they first appear will then begin to fade over time, so dont rely on the ghost icon shown off an older somewhat faded contact. Only rely on this if you know the contact just now showed up right then at that momment.
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"Chance favors the prepared mind"
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