HMS Fox (A320): A Cold War Survey Ship Built to Commercial Standards

One of Four Sister Ships

HMS Fox was a Bulldog-class hydrographic survey ship, one of four sister vessels built for the Royal Navy alongside HMS Bulldog, HMS Beagle and HMS Fawn, all constructed by Brooke Marine to commercial rather than strictly military shipbuilding standards, a sensible economy for vessels whose purpose was patient scientific survey work rather than combat.

Brooke Marine is a good example of the kind of firm that gets left out of naval history. It began at Lowestoft in 1874 as a foundry set up by John Walter Brooke, moved into boatbuilding in the early 1900s, and by 1911 had its own shipyard on Lake Lothing putting hulls in the water with engines built at its own works up the road. It made motor launches and landing craft during the war, opened a bigger yard on the south side of the lake in 1954, and between 1956 and 1987 turned out more than three hundred vessels: trawlers, ferries, salvage ships, landing craft, roll-on ferries, a great many fast patrol boats for export, four survey ships for the Royal Navy, and, in 1986, Richard Branson's Virgin Atlantic Challenger II. It was nationalised into British Shipbuilders in 1977, bought out by its own management in 1985, and closed in 1987. The yard passed to Brooke Yachts, which folded in 1992, and that was the end of shipbuilding at Lowestoft.

Built to commercial standards is a phrase worth unpacking, because it sounds like a criticism and was in fact good sense. A warship is expensive largely because of things that have nothing to do with going to sea: shock-resistant mountings so that machinery survives a near miss, zoned damage control with fire and flood boundaries, a citadel that can be sealed against nuclear fallout and chemical attack, redundant systems duplicated port and starboard, and the weight and cost that all of it drags in. A survey ship needs none of it. She is not going to be shot at; her risk is grounding and bad weather, and a merchant ship is built for both. Brooke Marine could therefore deliver a capable survey vessel for a fraction of what a naval hull would have cost, and the Royal Navy could afford four of them instead of one. What that hull actually did with its time is described in the article on her sister HMS Fawn (A325).

She displaced 800 tons standard, a properly modest size reflecting her role as a coastal and inshore survey vessel rather than an oceangoing warship.

The specification is worth setting out, because it explains the rest. She was a hundred and eighty-nine feet long, drove four Lister Blackstone diesels for about fifteen knots, and carried an eighteen-foot survey motor boat on the after deck. That last item is the important one. A survey ship does not do all her own surveying: the mother ship works the deeper water while the boat, with two or three people and an echo sounder, runs the lines close in, over the banks and up the creeks where a two-hundred-foot hull cannot go. The Bulldogs were also small enough and well enough found to stay out in the short, steep, unpleasant water round the British coast when bigger ships would have been driven in, which is precisely what a coastal survey vessel is for. Their reputation in the service was for seakeeping rather than comfort, which is the polite way of putting it.

Her sister ship HMS Beagle was launched on 7 September 1967 and commissioned in 1968, and HMS Fox followed close behind, launched on 6 November 1967 and commissioned on 11 July 1968, a properly tight production schedule for a class built in short order at Brooke Marine's Lowestoft yard.

A Working Career in Coastal Waters

HMS Fox spent her active career, like her three sister ships, conducting hydrographic survey work around Britain's coast, patient and unglamorous but remarkably essential work charting the waters that merchant and naval shipping alike depended on for safe navigation.

Where those soundings ended up is the part of the story that outlasts the ship. The Hydrographic Office of the Admiralty was set up by royal warrant on 12 August 1795, with a Scot named Alexander Dalrymple, formerly hydrographer to the East India Company, appointed as the first Hydrographer; he spent the thirteen years until his death assembling the first systematic set of charts of the world's important ports and seas. That office still exists, now a trading fund of the Ministry of Defence with around 850 people at Taunton in Somerset, and it still publishes the Admiralty charts. They are used today aboard more than nine out of ten of the world's internationally trading merchant ships. A Panamanian container vessel bound for Rotterdam, with no British connection whatever, is navigating on numbers that a chain of small British survey vessels has been collecting for two hundred and thirty years, and some of them were collected by Fox.

She was active through the Cold War decades, a period during which accurate, up-to-date charting of British coastal waters carried real strategic as well as commercial value, given the constant underlying tension with Soviet naval forces operating in the same waters.

The strategic point is worth making precisely rather than vaguely. A surface ship needs a chart good enough to keep her off the rocks; a submarine needs one good enough to run deep and fast through water she cannot see, where being wrong about the depth by a few metres is fatal. Britain's deterrent boats operated out of the Clyde and worked in the deep water off the north-west of Scotland, and every one of those passages depended on somebody having surveyed it properly first. The Soviet Union understood the same arithmetic and kept a large fleet of ostensibly scientific research vessels doing very similar work in and around the same waters, which is why survey ships on both sides were watched rather more closely than their unarmed, slow, resolutely uninteresting appearance would suggest.

How she actually knew where she was is the part that has since vanished completely. Every sounding is worthless unless you can say precisely where it was taken, and in 1968 there was no satellite to ask. Positioning was done by Decca Hi-Fix: a chain of shore transmitters put out synchronised radio signals, the ship measured the phase difference between them, and that gave a position on a lattice of hyperbolic lines printed onto the survey sheet. It was accurate to a few metres at close range, it needed the shore stations set up and calibrated first, and it drifted at night when the ionosphere changed. The Global Positioning System, which made every bit of it obsolete, did not reach full operation until 1995, six years after Fox left the Royal Navy. Essentially every sounding she ever took was fixed by radio waves bouncing between huts on headlands.

The wire sweep is the other lost technique and it is the one that saved lives. Sonar in the 1970s could tell you a wreck was there; what it could not reliably tell you was the depth of the single shallowest part of it, which is the only number that matters to a ship passing over the top. So the survey vessels did it mechanically. A wire was streamed between two boats, held at a set depth by buoys and weights, and dragged across the wreck; if it snagged, the obstruction was shallower than that, and the sweep was repeated a little deeper until it went clear. The depth at which the wire finally passed over was the charted least depth. It is slow, laborious, physically awkward work, and every one of those numbers on an Admiralty chart against a wreck symbol was obtained by somebody dragging a wire across it until it stopped catching.

The End

HMS Fox was sold in 1989, the first of her three sister ships to leave Royal Navy service, with HMS Fawn following in 1991 and HMS Bulldog continuing on until 2001.

Her working life did not end with the Royal Navy, either. Renamed H.V. Fox (IMO 8728359) for a second career as a commercial survey vessel, she was rechristened Plus Ultra in 1998 before reverting to her H.V. Fox name again in 2010, still earning her keep charting the sea floor decades after her naval crew had long since moved on, a rather more workmanlike retirement than that of her sister HMS Beagle, sold in 2002 and reborn two years later as the luxury yacht Titan. Detailed records of Fox's individual Royal Navy deployments and day-to-day service have proven considerably harder to trace than those of some of her better-documented sister ships, a fairly common fate for smaller, less glamorous vessels whose service, however truly useful, rarely generated the kind of press coverage that leaves a rich historical record behind.

What can be said with confidence is that she formed part of a truly important, if quietly unheralded, class of ships that kept British waters properly charted throughout some of the most operationally demanding decades of the Cold War.

The thinness of her record is itself worth a comment, and it is not a reflection on the ship. Warships generate paperwork because they generate events: actions, casualties, courts martial, dispatches, press coverage. A survey vessel generates fair sheets, which go to the Hydrographic Office, are turned into charts, and are then superseded by the next survey and filed. The output of Fox's entire career is not a battle honour or a citation but a set of numbers that were quietly folded into documents that most of the world's shipping still uses. It is a better legacy than most ships get, and it is completely anonymous.