From International Dictionary of Marine Aids to Navigation
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Alternative terms: A-scan, A-scope, Range amplitude display (G.B.)

A display in which the targets appear as vertical deflections from a line representing a time base.

Target range is indicated by the horizontal distance of the deflection from one end of the time base.

The amplitude of the vertical deflection is a function of the signal intensity.

Reference: I.R.E. (modified)

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)