Since the scales on the A-scope are logrithmic, the further right you go, the bigger the range jump over a smaller distance on the scope. I just make a best guess and usually I get a pretty good estimate of the ship's course after taking several readings over time. Ranges beyond 30,000 yards are really hard to guess and only serve to show you that there's a ship out there on a specific bearing.
In SH1, you started out with the A-scopes for SD and SJ radars. Later in the war the PPI scope got added to the boat for SJ. I always looked forward to getting the PPI upgrade.
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