The discussion went on thus, tediously, circularly, and without result, even as the skipper Ursel was carrying on a parallel exchange with the captain of the Royal Navy brig. By signal-flags, the brig ordered Sophia to allow herself to be overhauled. Sophia affected not to see, then, not to understand, the message; the brig stiffened it with a cannon-shot across Sophia ’s bow. Sophia, which by now had maneuvered into broader and deeper waters off Foulness Sand, raised sail, and began to make run for it by sailing closer to the wind than the square-rigged brig was capable of. This got them several miles nearer the open sea, for the wind was generally out of the east, which was the direction they wanted to go. They zigzagged, sometimes sailing a few points north, sometimes a few points south, of due east. The brig did likewise, but had to take wider and more pronounced zigzags, which ought to have made it slower. So it looked favorable for Sophia, at least by this simple account. But as the morning wore on, it became evident to Caroline (who was observing closely, as she looked forward to inheriting a Navy) that this was very much a devil-in-the-details sort of matter. The brig was capable of moving through the water faster than Sophia, so the difference in net speed was not quite as great as all that. And the brig had a proper pilot aboard, who knew where the shifting sands at the mouth of the river were today . Whereas Ursel had to work from a chart that had been printed ten years ago and was now a palimpsest of confusing hand-drawn cross-hatchings, and angry and emphatic notes in diverse Northern European languages. On account of which Sophia ’s actual course, far from being the stately zigzag she would have traced across deep blue water, was a jangled fibrillation about due east, careering to one side or another whenever Ursel phant’sied they were approaching some peril rumored on the chart, or when the trend of the soundings was inauspicious, or the color of the water or the texture of its surface did not please him. Much time was spent, and much of Sophia ’s forward momentum pissed away, in frequent course-changes, even as the brig loped easily back and forth across the estuary, plotting each tack to pierce invisible gaps between the Middle, the Warp, the Mouse, the Spile, the Spaniard, the Shivering Sand, and other Hazards to Navigation too small or too ephemeral to waste names on. It was altogether tense, chancy, and perilous, and so ought to have been thrilling. Yet it stretched out over half the day, and as much as an hour would sometimes go by without anything in particular happening. It was a bit like sitting by the bedside of a loved one with a grave illness: momentous, all-consuming, yet boring, hence exhausting.