The transceiver on the end of the pole. While underway, the transceiver is secured to the side of the ship (as pictured). The transceiver is lowered into the water when used to send signals to Sentry.
The Transceiver on the Pole
Image courtesy of Exploring Carolina Canyons expedition. Download larger version (jpg, 3.8 MB).

The transceiver on the end of the pole. While underway, the transceiver is secured to the side of the ship (as pictured). The transceiver is lowered into the water when used to send signals to Sentry.

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