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Unfamiliar word? Select a dotted-underlined term for its meaning.
Read the picture
Think of a plot as a report of where something was detected. A track joins reports that the system believes belong to the same contact over time. That gives you a developing picture of position and movement, with data alongside it.
What the player sees
The trail behind a contact records earlier positions: history dots, or plots. The current symbol, identity letter, leader and trackblock have different jobs. A new detection does not instantly carry all the information of an established track.
Think of two successive reports
One detection tells the system where something was detected at one time. Associating later reports with it lets the system follow the contact. The displayed track is the developing picture built from those reports.