WEBVTT

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Native Android recording: Lumina K706, HELM 206.
1 November 2026 · original speed.

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Live own-source echoes on the test setup.
Displayed depth about 1.07 m; not absolutely calibrated.

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Hide the A-scope.
The echogram continues.

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Show the A-scope again.
The displayed rates vary during the recording.

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The other header telemetry remains labelled as simulated.
This recording is not acceptance testing aboard a boat.