In sea-stabilized ARPA operation with true tracks, data relating to own ship's motion is fed to ARPA from which instruments?

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Multiple Choice

In sea-stabilized ARPA operation with true tracks, data relating to own ship's motion is fed to ARPA from which instruments?

In sea-stabilized ARPA with true tracks, you need to feed ARPA with your own motion data—how fast you’re moving and in what direction you’re headed. The speed log provides your speed, while the gyro delivers your heading as a true direction. With these two inputs ARPA can update its own-ship motion and convert the radar’s relative target plots into true tracks, keeping the targets' positions accurate in a true north frame. The other options don’t supply this essential pair. An echo sounder measures depth, not motion. The radar itself is the plotting sensor, not a source of motion data. GPS and compass could offer some motion information, but for consistent true-track plotting in sea-stabilized mode, speed from the log and heading from the gyro are the standard inputs.

In sea-stabilized ARPA with true tracks, you need to feed ARPA with your own motion data—how fast you’re moving and in what direction you’re headed. The speed log provides your speed, while the gyro delivers your heading as a true direction. With these two inputs ARPA can update its own-ship motion and convert the radar’s relative target plots into true tracks, keeping the targets' positions accurate in a true north frame.

The other options don’t supply this essential pair. An echo sounder measures depth, not motion. The radar itself is the plotting sensor, not a source of motion data. GPS and compass could offer some motion information, but for consistent true-track plotting in sea-stabilized mode, speed from the log and heading from the gyro are the standard inputs.

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