20-Mar-2020 18h58m04sZ, 7.631.5 MHz, USB by caylorman

published on 2020-03-21T15:59:02Z

20-Mar-2020 18h58m04sZ, 7.631.5 MHz, USB UNID "sonar ping" signal recorded 20 MARCH 2020 at 1858UTC on 7631.5 kHz

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