Position: 49°51’49.7″N 6°24’34.4″W

Rear Admiral Cloudesley ShovellLet’s continue our periodic series on famous sea captains with a portrait of Sir Cloudesley Shovell. Not the retro-Metal band, but the man behind history’s greatest name for an Admiral. A snappy name is not, however, the basis of his fame. Nor is his notoriety based on his early years as an eager rating making his ambitious and rapid way up the greasy pole of naval promotion.

Born in 1650 in modest circumstances, Shovell went to sea at 13 as a lowly cabin boy. He gained notice after a few watery fits of derring-do. His family would recount the tale of their 17-year-old lad swimming between two English warships battling the Dutch Navy with orders clenched in his teeth. Back then, sailor’s superstition held swimming was bad luck. Swimming invited sinking.

Rising to captain in 1677, he sailed HMS Sapphire to the Mediterranean and defended Tangiers from Salé raiders. Returning to England at the end of the 1680s, Shovell patrolled the Irish Sea from the Scilly Isles (aka the Scillies) to the coast of Ireland. Thrashing the French Fleet during the battle of Bantry Bay in 1689 earned him a knighthood and promotion to Rear Admiral the following year. Dabbling in politics, Sir Cloudesley served as Member of Parliament for Rochester for a term before his promotion to full Admiral in 1702.

Short List

His portrait shows a confident, well-fed man and the kind of leader with high expectations of his crew. I’d venture he would never expect anyone to do anything he wouldn’t do himself. That particular list would have been exceedingly short. After battling the Dutch, the Irish, the French and the Spaniards on Europe’s seas for forty years, Shovell was widely regarded as one of the finest sailors and navigators of his age. Yet, despite his rollicking naval resumé and political success, none of his early heroics were quite enough to overcome his ignominious fate.

Scilliness

Sir_Cloudesley_Shovell-featuredIn January 1705 he ascended to Admiral of the Fleet. Two years later he was back at sea for the Spanish War of Succession. Shovell led a fleet of 22 ships from his flagship HMS Association to the Mediterranean and engaged the French at Toulon. The French proved unengaging. Frustrated, the navy ordered Sir Cloudesley back to England. After passing the Bay of Biscay in a series of gales, the weather on October 21, 1707, lifted long enough for the fleet captains to take a latitude sight and correlate that with soundings of 93-130 fathoms (1 fathom = 6 feet, or 182.88cm). Together the measurements indicated they were approximately 200 miles W-SW of the Scillies.

The fleet sailed on towards the English Channel, heaving to (stopping) at 16:00 on October 22 to take soundings. The weather had deteriorated and taking a latitude sight wasn’t possible. Nevertheless, satisfied with their progress, at 18:00 Shovell gave the order to sail on – directly towards the rocks of the Isles of Scilly. At 20:00 HMS Association ran hard aground on Outer Gilstone Rock. The ship took three minutes to sink and 800 men went down with her. In total, four ships, an estimated 2,000 men and Admiral Sir Cloudesley Shovell were cast into Neptune’s cold embrace that night.

Crypto
stranded-manatee
Click on the image to read more about this manatee’s rescue.

Sharp readers might be tempted to embroider a conspiracy theory out of the event. It has all the necessary threads of truth. Had an admiral of Shovell’s stature drowned today, terabytes of speculation would have stuffed Google’s hard drives fuller than a six-pack of Nathan’s hotdogs. Trolls would concoct something about how the French paid him off with millions in Bitcoin to do a job they couldn’t do themselves. After all, his fleet foundered on the Scillies. An area that Cloudesley had patrolled for two years and knew well. Perhaps his knowledge and experience gave him more confidence than it should have.

Local legend tells us the plucky Admiral swam to shore. A woman scouring the beach for plunder stumbled across our exhausted hero as he lay prostrate like a stranded manatee. Examining his body she took an immediate fancy to his large emerald ring. Rather than fight him for it, she instead suffocated him with a couple of handfuls of wet sand. A few minutes later the prize was hers without argument. Today, a small white column stands where Sir Cloudesley burbled his last bubble for the sake of a bauble. (🙄 – ed.)

It was and remains the Royal Navy’s greatest loss of ships and men in a single incident. The sheer scale of the disaster coming at the hands of a expert sailor and navigator could not be brushed off as bad luck or mere drunken incompetence. Something had to be done to improve navigation at sea. More specifically, how to accurately calculate longitude.

Jacob’s Staff

Early in the 18th century treading the well-trod waters around England was carried out through a combination of latitude sights, depth soundings, and dead reckoning.

The ability to measure one’s position north or south of the equator (latitude) has been known since at least 325 BCE. Latitude can be measured by observing the angle of the sun or stars with something as crude as a cross-staff or Jacob’s staff (see illustration). The problem was knowing where you were east to west, i.e., your longitude.

Plumbing the Depths

Olaus Magnus Historia om de nordiska folkenNearing the Scilly Isles, Shovell’s fleet knew it was heading into shallower waters because they made soundings. In other words, they dropped a lead weight with a bit of tallow on it overboard and measured the amount of line let out. Sand and pebbles would stick to the tallow (beef fat) confirming the leadsman had indeed struck bottom.

On Aleta we use our sonar depth sounder to help verify where we should be. If the depth of the water indicated on the chart roughly matches the depth sounder’s reading, we take that as a win. If the chart and sonar don’t agree and we are in unexpectedly shallow water, general panic breaks out until the calming hand of the captain takes the helm and steers Aleta back to safety. (🙄 – ed.)

The Short and the Long of It

Dead reckoning is just what it sounds like. Briefly, you take a sight (if you can), make a sounding (if you can), keep an eye on your log (speedometer) and maintain a heading using your compass. All the while feeling for currents and watching your stern wake for drift. Sailing in a known direction at a known speed for a measured amount of time (an hourglass will do nicely) allows for a simple calculation of estimated position. At night and in cloudy weather you are at the mercy of nature, your fallible instincts and faulty mathematics. Despite keeping within sight of each other, log position entries from the surviving ships of Shovell’s fleet varied by as much as 40 miles.

Longitude on the other hand cannot be observed directly and requires a lot of complex math to get right. Just ask my uncle. It also requires knowing the precise time in Greenwich, England, however far away you are. On a creaking, pitching ship sailing around the far side of the world, such technology simply did not exist in 1707. To its credit, the British government understood the problem and passed the Longitude Act in 1714 to solve it. The act offered a prize of £20,000 (equivalent to about £3 million today) to anyone who could devise a practical and reliable method of finding longitude at sea. That, as they say, is another story. Read: Longitude – by Dava Sobel.

By Jeeves!

If you visit Westminster Abbey, head to the south choir aisle. There, not far from P.G. Wodehouse, you will find the mortal remains of Sir Cloudesley. His extravagantly carved memorial was hewn from solid marble at the behest of Queen Anne. His was a courageous life, but his death was, perhaps, his greatest contribution to Queen and Country. By fetching up on the rocks he instigated the development of accurate mechanical timekeeping and the reliable calculation of longitude. Within a hundred and fifty years of his death Britannia ruled the waves and eventually held dominion over a quarter of the Earth.

Notes


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2 Comments

  1. Having been directly challenged to take part, here goes: Your description of the longitude problem and your commendation of Dava Sobel’s book are spot on. So I have to pick nits:
    1. Dead Reckoning is so called because it uses no “live” measurements of the world outside your boat. Starting from a “known” (well or badly) position at a known time, you depend on your compass to show your course based on the earth’s magnetic field as it appears at your helm, your knotmeter (or approximate eyeball observation) to know how fast you’re moving through the water passing under your keel, and your ship’s clock for time. “If I was there then, and I’ve been sailing on this course at this speed for this amount of time, then I can use fairly simple arithmetic to find my DR position now.”
    2. Soundings are not part of DR, but may help you augment the DR position with an EP (Estimated Position)
    3. There’s no way to “feel” for current, which is simply the uniform motion over the ground of all the water you can see, wake and all.*
    4. What you see when you look at your wake is leeway, your “crabbing angle” caused only by wind pushing you (slowly) sideways through the water–nothing to do with current.
    5. “Drift” should be reserved to mean just “speed of the current over the ground.”
    * Your Aunt Vicki claims to be able to feel the current through her feet while at the helm, but I don’t see the physics of that. Just about all her sailing has been coastal, so I think she has a talent for integrating what she can see (land and buoys) to estimate current.

    Adm. Shovell’s DR problem was that their “initial” position, where they changed course to enter the Channel, was very badly known indeed. None of the ships had been able to measure anything for days. Or … just maybe? … one ship’s navigator had gotten lucky and made an observation, because his estimate of that position was quite good. In the meeting of the fleet’s navigators, he was a minority of one and was scornfully ignored. Superior skill? Blind luck? Ask your local medium; nothing I can say will be any better.
    This Thanksgiving, remember to give thanks for Yorkshire clockmaker John Harrison and his seagoing chronometers H1 through H4.

    Unk
    1. Thanks Unk! Of course the editor in his efforts towards readability and clarity cut every word of your comments out of my original manuscript. (Hah! – ed.) That said, I also want to acknowledge Vicki’s kinetic ability to maintain a DR course in addition to your more calculating approach. After sailing several seas I have found both methods invaluable. Note: I was put in mind of JFK, Jr. and pilot disorientation (not knowing up from down) when I wrote this. Having crossed strong currents in reasonably short distances I believe we experienced crabbiness in addition to wind drift. Islands in the Bahamas, for example, are notorious for strong tidal currents as you cross the mouth of an inlet. I will correct my editor’s bowlderisation of the (k)not-a-meter as an essential ingredient for Dead Reckoning.

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