Which information is least dependent on ARPA processing?

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Multiple Choice

Which information is least dependent on ARPA processing?

ARPA processing handles automatic target tracking, history, and predicted vectors from radar returns. The measurement overlays used to read bearing and range, an electronic bearing line (EBL) and a variable range marker (VRM), are simply display tools that the operator can use with or without ARPA tracking. They don’t rely on the ARPA processor to generate or update target tracks or forecasts, so they are the least dependent on ARPA processing. By contrast, radar history data come from ARPA’s tracking history, and ship’s speed through the water is an input ARPA uses to compute relative motion and predict trajectories. Cloud cover information, while it may appear on some displays, typically stems from meteorological sources rather than ARPA tracking.

ARPA processing handles automatic target tracking, history, and predicted vectors from radar returns. The measurement overlays used to read bearing and range, an electronic bearing line (EBL) and a variable range marker (VRM), are simply display tools that the operator can use with or without ARPA tracking. They don’t rely on the ARPA processor to generate or update target tracks or forecasts, so they are the least dependent on ARPA processing. By contrast, radar history data come from ARPA’s tracking history, and ship’s speed through the water is an input ARPA uses to compute relative motion and predict trajectories. Cloud cover information, while it may appear on some displays, typically stems from meteorological sources rather than ARPA tracking.

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