Whitman offers up a rough, improvised song to the sea and everyone who sails it. He starts by sketching the scene: the endless waves, the spray, the wind, and the brief, fitful signals passing between ships. His real attention, though, is on the sailors themselves — especially the quiet, unshakeable few who seem handpicked by the ocean, utterly at home in its danger. There’s a feeling of deep, almost primal admiration here. He personifies the sea as a tough old nurse who raises and unites these heroes across nations.
The poem then swells into a kind of visionary demand. The speaker asks the sea to keep flying all its national flags and signals, but also to raise a single spiritual pennant above them — a universal emblem for every brave captain and mate who has died at their post. The mood shifts from gritty, salt-sprayed immediacy to something larger and more solemn, like an eternal waving tribute. It’s both a gritty dockside shout and a hushed, timeless salute to shared human courage.