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Pilot Flags

Last modified: 2017-11-11 by rob raeside
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The pilot flag is hoisted by incoming vessels who require the services of a pilot, for guidance in a harbor or trough canals for example. Formerly, the national flag (or a variant) with a white border, today the signal flag for G.
Alex Danes, 23 April 2011

In navigation, a pilot is someone who is able to navigate local waters better than a ship's navigator. Where a navigator's main concern is getting the ship from port to port, a pilot will concerned with manoeuvring a ship at a specific location. Each pilot has his own area of expertise: Some are, for example, employed to move ships in and out of the port of Rotterdam, others will guide ships through the Sound or through the ice of the Northern Sea Route, etc.. In some situations, pilot service is mandatory, in others it may merely be advised. Several signals are associated with pilots:

Pilot flag (Pilot Call flag): This is the signal hoisted on a ship that needs a pilot. "I require a pilot." Internationally, this is currently the ICS flag G. Not all countries use the international signal, though. In the ICS before 1933 this was S, which went back to a British Royal Navy signal from before 1800. As the Union Jack was used for that original signal, similar signals were/are sometimes called "Pilot Jack", which also serves to reduce the confusion between "pilot flag" and "pilot's flag". In the past, sometimes the pilot flag would differ by calling ship. E.g. in Italy the pilot flag used by a war ship differed from that used by a merchant ship.

"Pilot Aboard": A signal, usually a flag, but I expect several of these signals can be replaced by lights at night, for those who like to make things difficult for the pilot. As a ship takes the pilot on board, this flag replaces the pilot flag. Currently this is the ICS flag H: "I have a pilot on board".

Pilot service: Flag of a local pilot service, to identify its vessels or coastal stations. This may be a specific pilot ensign, a pilot pennant or some other dedicated flag signal. In some cases this flag is also used as pilot call flag. That may be for historical reasons, or to be able to distinguish pilot services with different function, e.g. a sea port and an estuary allowing further inland access. In ports with combined services, pilot vessels may fly the harbour authority flag as their pilot service flag. (Probably some service somewhere has had separate flags for coastal stations and vessels, but I don't know of any example.) Unfortunately, it appears this too is sometimes called a "Pilot Jack".

Pilot's Flag ("Pilot available"): Signal to indicate a pilot is available. This may be flown from a coastal station or from a vessel waiting at an entry point for a piloted area. In some countries a distinction is made between a "Pilot", who has official status and a set level of expertise and operates a busy route or port, and a "Local", who has no, or little, expert training or official status, but merely knows his way around the area he lives in, though this need not make him inferior. The difference in some cases is expressed in a difference between the flags flown by a pilot or a local. Other countries don't use a dedicated signal, but use "Pilot Aboard" and/or "Pilot service", or even the pilot call flag.

"Pilot transported": A specific signal used in some instances to indicate that a vessel is bringing out a pilot, to distinguish it from other pilot vessels in the area. This seems to function partly as a right of way signal, and partly as confirmation of the pilot flag aboard the waiting vessel. Again, this may also be signaled by some of the other flags.

Pilots Flag: Fan flag for the Portland Pilots.
Peter Hans van den Muijzenberg, 24 April 2011

The change from "national pilot signal flags" to "international pilot signal flags" began just over a hundred years ago. In 1899 the International Code of Signals Committee wrote; "We recommended that flag S when hoisted alone should be an international pilot signal signifying 'I want a pilot.' At present the single flag signal to be used by British vessels requiring a pilot is the Union Jack with a white border. This flag is not suitable for international use, and there is great diversity of practice among foreign countries in regard to the signal to be made by vessels wanting pilots. Some countries use their jacks with a white border, while other countries use their ensigns or jacks without a white border, or the blue peter or a special flag; and others seem to have no single flag signal for a pilot and use the flags P and T of the International Code, which mean 'I want a pilot'. We gather that foreign maritime powers are generally agreed as to the desirability of there being an internationally recognised single-flag signal for a pilot and we are of the opinion that flag S (blue centre with white border) is well adapted for the purpose. We therefore recommend that the Board of Trade should obtain an Order in Council making legal the use of flag S as a signal for a pilot."

At that time the Order in Council in force stated that "the following signals, when used or displayed together or separately shall be deemed to be signals for a pilot in day-time;

  1. At the fore, the Union Jack having around it a white border, one fifth of the breadth of the flag;
  2. The International Code pilotage signal indicated by P.T." An Order in Council of 28th June 1900 added;
  3. The International Code Flag S, with or without the Code Pennant over it;
  4. A distant signal consisting of a cone pointing upwards, having above it two balls, or two shapes resembling balls.

In Flags Of The World published in 1915 Gordon wrote that "the old pilot signals appearing in the books are seldom seen."

When the Signal Code was revised in 1934, another Order in Council of 9th October 1933 (effective 1st January 1934) changed the list to;

  1. The International Code Signal G
  2. The International Code Signal P.T.
  3. The Pilot Jack hoisted at the fore.

As far as I know the Pilot Jack (the white-bordered UJ) ceased to be a pilot signal in 1970.

The flag for a pilot boat was defined in the Pilotage Act of 1808. It specified that a Pilot Boat was to be, "fitted with black sides and have the upper strake next the gunwale painted white and shall carry a vane at the masthead or else a flag on a sprit or staff or in some other equally conspicuous situation; which vane or flag shall be of large dimensions proportioned to the size of the boat or vessel carrying the same and shall be half red and half white, in horizontal stripes of which the uppermost shall be white."

This white over red flag was confirmed in section 612 of the Merchant Shipping Act 1894 and section 613 added; "When a qualified pilot is carried off in a vessel not in the pilotage service he is required to exhibit a pilot flag (i.e white over red) to show that the vessel has a qualified pilot on board."

This flag could be flown under the ensign, at the jack staff, or the triadic stay. I think it was normally flown under the ensign when the captain of the ship was also a qualified pilot, which was likely in ferries or vessels on regular coastal runs.

In 1934 International Code Signal H replaced the white over red flag.
David Prothero, 9 July 2001

In the old days, a merchant vessel would fly a pilot jack of its country of origin at the jack staff, as a signal to request a pilot. However, not every nation had its own version of the pilot jack. Therefore the old ICS(pre-1930, IIRC) prescribed the flag 'S' (white with blue rectangle, or blue with white border, depending on how you see it) as the pilot jack, if no national version was available. Since 1930, ICS 'G' has been used instead to request a pilot (not 'H', which is really the signal of a pilot *on board*).
Miles Li, 10 September 2003

Merchant Jack Miscellany

The Merchant Jack was also called, Stem Jack, Signal Jack, Jackstaff Flag and of course, Pilot Jack.

The term Pilot Jack, according to Cecil King, first appeared in an official printed document in the Royal Navy General Signals of 1868, but not in Merchant Navy publications until the 1900 revisions to the Code of Signals. It was being used in Orders in Council by 1933, probably incorrectly, as it had not been defined.

Until compelled to fly the swastika flag as a jack, the German liners sailing out of Hamburg and Bremen flew the pre-1867 national flags of those cities as jacks.

Clan Line ships were given the name of a Scottish clan, and in the early 1950's flew the tartan of the clan for which they were named as a flag at the jackstaff.

At one time it was the practice of some shipping companies to fly the national flag of the next country for which they were bound at the jackstaff whilst in port.

It probably arose because the Union Jack was used generally for summoning officers to the flagship. The rank of officer was indicated by the position in which the Union Jack, sometimes in combination with a pendant, was hoisted. In 1782 yellow pendant over Union Jack meant, "For all pilots or other persons qualified as such", and in 1799 Union Jack alone meant, "For a pilot to come on board".

In the 1817 edition of Marryat's Code the Union Jack was not used as a single flag hoist to request a pilot. The three flag hoist "741" meant, "Send me a pilot from the shore", and "743" meant, "I have no pilot".

This suggests that the Union Jack as the signal for a pilot was not introduced until about 1822, and that the Admiralty acted immediately there was a responsible person against whom they could proceed. While the use of the Union Jack by merchant ships was unofficial, it would have been possible to pursue ship's captains or owners only on an individual basis when the offence was committed.

As soon as the white-bordered Union Jack was adopted by the Royal Navy, a plain Union Jack flown at the fore identified the ship to which boats or officers indicated by a previous signal were to proceed. [Functions of the Union Jack by A.A.Purves in Mariner's Mirror July 1951]
David Prothero, 10 September 2003

I gather that German merchant ships still (again) follow this practice, flying the flag of the homeport at the jackstaff. But--and I'm far from an expert on German flag terminology, as my recent excursion into Flagge/Fahne will have made clear--this flag seems to be called in German a Bugflagge (bow flag), with the term Gösch (jack) confined to the national jack. At least, that's what I gathered from an online German maritime dictionary that I looked at a long time ago.

And by the way, here's a bit of merchant jack miscellany to add to the mix. In Joseph Conrad's "The Nigger of the Narcissus" (1897), the title character has just died and is to be buried at sea: "On two planks nailed together and apparently resigned and still under the folds of the Union Jack with a white border, James Wait, carried aft by four men, was deposited slowly, with his feet pointing at an open port." Joe McMillan, 10 September 2003

David has drawn, what in my opinion, is an important distinction in the fact that use of a UJ with a white border is legally permitted as a jack (and is so used), but that such usage is questionable in so far as it may well not have been the intention of those who drafted the original Order in Council of 1864, nor of the subsequent Merchant Shipping Act of 1894 (upon which the relevant clauses of later versions of that Act were based)

Article 4-(1) of the current Merchant Shipping Act (1995) forbids the wearing of the following colours:

4-(1)(a) any distinctive national colours except:- (i) the red ensign, (ii) the Union flag (commonly called the Union Jack) with a white border, or (iii) any colours authorized or confirmed under section 3(3)(b) - which covers defaced ensigns - or,

4-(1)(b) any colours usually worn by Her Majesty's ships or resembling those of Her Majesty, or

4-(1)(c) the pendant usually carried by Her Majesty's ships or any pendant resembling that pendant.

At the end of the day the flag is used as a civil jack, and there is nothing in law to say that it may not be so used, so pending some form of flag legislation (which his country sorely needs) the situation remains a little obscure.

Christopher Southworth, 11 September 2003

4 March 1935. The Honourable Company of Master Mariners wrote to the Admiralty asking, "Is the Pilot Jack a proper flag to be displayed at stem head of a merchant ship ?"

The letter was circulated for comment, and the Admiralty Librarian, D.B.Smith wrote, "Commander Mead is carrying on Perrin's research into the record material about flags, and is finding many preconceived notions are not in accordance with the intentions of the regulations, when studied in the light provided by the actual papers on which they were issued."

4 May 1936. The Head of the Naval Law Department concluded, "Nobody has yet disclosed any official authority for it to be flown as a jack. This flag is not legal as a jack under present law. The phrasing of Article 73(2) of the Merchant Shipping Act of 1894 is ambiguous, but refers to its use as a pilot flag only."

At the same time the Naval Law Department was being pressed by the Board of Admiralty to permit use of the white-bordered Union Jack in combination with International Code letter ' M ' as a signal for ships entering and leaving Dockyard Ports. On 18 December 1936 the Department Head wrote,

"Random use of the Pilot Jack would appear to be illegal in view of the terms of the Pilotage Act 1913, Section 45. That section says that HM may, by Order in Council, make rules as to the signals to be used where the services of a pilot are required, and that to use any pilot signal for any other purpose than that of summoning a pilot is an offence punishable with a fine not exceeding twenty pounds. Order in Council 9 October 1933 constituted Pilot Jack hoisted at the fore as a pilot signal for the purpose of this Act. The law clearly has not been strictly enforced, but its existence does seem a reason for not acting in contravention of it. It is true that by the same Order in Council other ships present hoist the Pilot Jack when Red Ensign over ' M ' is flown by a ship under way and this practice has not been challenged. Two wrongs do not make a right. It would also be illogical for the Admiralty, after opposing on the grounds above, the flying of the white-bordered Union Jack as a jack by merchant ships, (as a consequence of which other designs for the Merchant Jack are under consideration at the Board of Trade), should then require their ships to fly it in certain Dockyard Ports."

Later that month, Head of Naval Law wrote, "It is true that this Act has not been strictly enforced, and indeed under those very Dockyard Port Orders in Council the Pilot Jack is laid down for a purpose other than summoning a pilot, but this usage was introduced during exceptional wartime conditions, and in any case is hardly a reason for extending its illegal use."

The Admiralty sought the opinion of the Board of Trade who replied on 19 Apr 1937 that, "The Board are disposed to think that the use of the Pilot Jack for any purpose other than summoning a pilot is undesirable, and is probably in contravention of Section 45 of the Pilotage Act 1913."

The possibility of issuing an Admiralty warrant to legalise use of the white-bordered Union Jack as a merchant jack was considered. However on 7 May 1937 the Marine Department wrote to the Admiralty, "The Board (of Trade) are advised that there is doubt whether a ship is entitled to fly the Pilot Jack for any purpose other than summoning a pilot. Further advised that though there is power under Section 73 of Merchant Shipping Act 1894 to issue warrants authorising substituting other national colours for those laid down in that section, it is doubtful whether there is power by warrant to authorise the use of any national colours in addition to those not already agreed."

This was followed by a letter to Naval Law, "We have replied to various merchant service organisations, which have advocated the use of the Pilot Jack to be flown as a jack at the bows of merchant ships, that we cannot support the adoption of this particular flag on legal grounds."

However at some time in 1937 a Board of Trade Notice was issued stating that British merchant ships might wear a square Red Ensign, or Blue Ensign, as appropriate, at the jackstaff, though no official exception would be taken to continuance of the frequently adopted practice of displaying a small Pilot Jack, the Union Jack surrounded by a white border.

In 1939 Naval Law wrote (NL 863/39) to the Board of Trade that the white-bordered Union Jack was used by the Navy, but only as a signal, and recommend that the merchant jack should be a square Red Ensign for which there was a precedent of 1694.

The discussion was interrupted by the Second World War, but continued in 1946. There was now a campaign to make the ordinary Union Jack the official Merchant Jack, in recognition of the contribution made to the war effort by the Merchant Navy . Questions were asked in Parliament on 16 October, 23 October, 11 December 1946, and 21 January 1947.

On 5 February 1947 the Private Secretary to the Parliamentary and Financial Secretary, Ministry of Transport wrote that, "The Merchant Navy already flies a flag which incorporates the Union, and that being so, the First Lord and the Minister of Transport do not consider there is a reason to change the present practice."

The Ministry of Transport, which had taken over the Maritime Department of the Board of Trade, were not particularly interested in the question of a merchant jack, and the Admiralty's only concern was that it should not be the Union Jack.

13 May 1949. The Ministry of Transport wrote to Naval Law asking how queries about use of the white-bordered Union Jack should be answered. Naval Law apparently suggested that the Ministry should take legal advice.

The Treasury Solicitor reported to the Ministry of Transport that in relation to Order in Council 1933 (SR&O 1933 No.976), the white-bordered Union Jack was a signal, only if hoisted at the foremast, and that there was no offence committed, under that section, if it was hoisted elsewhere. Nor did he think that use of the flag as a merchant jack was an offence under Article 73 of the Merchant Shipping Act 1894. He wrote, "It may well be that the intention was to bring this section into line with the fact that this flag was in use as a pilot signal, but unfortunately, in my opinion, failed to do so. What it should have done was to except this flag only when used as a pilot signal. As it stands however, there is in the section no qualification regarding the use of this flag."

On 21 June 1949 this legal opinion was passed on to Naval Law, who, on 7 September 1949 wrote back, "The Board (of Admiralty) has no objection to you writing to interested bodies informing them that the Union Jack is incorrect and that the correct jack is a square version of the Red Ensign, but there is no reason to discourage the existing practice of flying the Pilot Jack at the jackstaff."

This is the most recent information that I have been able to find. It is in the National Archives (PRO) at Kew, mainly in ADM 116/3799, but also ADM 116/3566, ADM 1/19969, ADM 1/21665, MT 9/4365 and ADM 205/55. I hadn't time to read everything closely, but I think that I extracted a fair summary. The white-bordered Union Jack ceased to be a signal for a pilot in 1970, which obviously removes one objection to its use as a civil jack. However I think that to say that the white-bordered Union Jack "is a legally permitted jack for merchant ships" is wrong. It was introduced as the signal for a pilot, and although it is no longer that, no legal action has been taken to make it a civil/merchant jack. It is more accurate to say that its use as such, "is permitted", or "is not illegal".
David Prothero, 11 September 2003