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Endurance and offshore, by the rule book

In plain words. Long-distance racing as the rule books write it: the IJSBA gave it a full section in 2002 and now refers riders to another series' rules, while the UIM and the IHRA write longer rules of their own. The few pages that exist for individual races are read too, but no winner, entry count or founding year is given.

Long-distance racing is the discipline the rule books treat most differently. The IJSBA wrote four pages on it in 2002 and now sends riders to another series' rules; the UIM writes three formats with distances and clocks; the IHRA spreads it across its book and names a class for it. This chapter reads those texts side by side, then reads the series and races as the documents that exist for them, and says what none of them carries.

Words on this page (1)
ENDURANCE EVENT
An IJSBA event type. A long-distance race of more than one lap, which may or may not include required turns.

Endurance in the 2002 book

Confirmed

The 2002 book defines the event in section 11.5 in one sentence, that endurance events are long-distance races which may or may not include required turns and be of more than one lap, and sends the reader to section 15, pages 44 to 47. Section 15 has seven parts. 15.1 says the type of start is explained at the riders meeting because shorelines and water vary, and that craft enter the course through the start area only, at idle, with no practice starts. 15.2 describes four starts. In a LeMans start riders line up on shore at equal distances from their craft, each steadied by one holder, and race on foot to it at the signal; in a Driscoll start the rider stands in front of the craft facing shore, hands together on its nose; a Timed start sends riders one at a time at 15- or 30-second intervals, with finish times corrected; a Running start has engines idling until the signal. Craft are lined up no less than 1m (3 ft.) apart, one mechanic per rider is allowed in the start area, and holders may not use ropes. 15.4 requires wristbands marked with last name and race number, with a rule for team-class competitors, makes it a rider's duty in long-distance events to report injured riders and disabled boats to the nearest official, sets red buoys for left turns and yellow for right, and two finish buoys. 15.5 makes the fuel system a closed one on the original tank, with the filler mounted through the deck so that no internal refuelling is possible, vapor separators no larger than 2 in. by 6 in., no additional reservoirs, and 5 mph in the lane to the pits. 15.6 lists nine items the Race Director or local authorities may require, from a compass and tow rope to a VHF radio, flares and a repair kit. 15.7 allows stop-and-go and time penalties. Section 17.8.11 of the 2002 book scores endurance and offshore on its own table, 100 points for first, 95, 92, 90, 88, 87, 86, then 85 for eighth and one fewer for each place after. Section 5.4 of the 2002 book lets a runabout for Endurance and Offshore-type events only run to 394.0cm (156 in.) against 320.0cm (126 in.) for the rest, and the homologation list marks two runabout models, the Genesis and the WaveRunner SUV, as eligible for Endurance competition only.

Sources: 2002 rule book

What the three current books do with it

Confirmed

Every IJSBA book held from 2002 to the 2015 draft carries section 15 under the same seven headings. The 2010 book adds a paragraph on the penalty buoy, commonly called the Black Buoy, as the preferred way to correct a missed buoy, keeps the 394.0cm endurance hull allowance beside a closed-course limit now printed as 354cm, and rewrites the endurance and offshore scoring table to 400 points for first, 380, 368, 360, 352, 348, 344, 340 and so on, continuing in increments of two until 40th position and one after that; the 2011, 2012, 2014 and 2015 texts print the same part. The current set does not. The rule book page read on 28 September 2026 links twenty class documents and no endurance document, and the general document behind it names endurance once, in GEN.9.1, and has no endurance section. What it keeps is the definition. MEM.15.1 of the Competition Membership document repeats the 2002 sentence word for word and then sends the competitor to the General Competition Rules as well as P1 Aqua X Rules, a series' rules rather than the association's; the general rules name endurance among the forms of competition and apply the flag rules to it, as our rules record reads them, and say nothing else about how it is run. The UIM's 2026 Aquabike book writes three long-distance disciplines in rules 317.01 to 317.03, Jet Raid, Offshore and Endurance, each with a figure, and a fifteen-article procedure in 318; its runabout hull length extends from 360 cm to 394 cm for Endurance only, the same 394 figure the IJSBA printed in 2002 for Endurance and Offshore-type events. The IHRA book, version V.20260603, defines endurance in C.1.2 as long-distance races that may be point-to-point or on expansive multi-lap courses, solo or in teams with one rider aboard at a time, stages it in G.7, penalises craft changes for it in G.12.2, gives it its own clothing, whistle, back-protection and tow-rope rules, scores an endurance moto at 25 points against 60 for closed course in F.1, and writes a technical class for it in section W, Runabout Endurance, open to seated four-stroke craft up to and including 325 manufacturer-rated horsepower. Side by side, the association that wrote four pages in 2002 now writes three sentences, the UIM writes three pages of figures, and the IHRA is the only one of the three whose book names a technical class after the discipline.

Sources: IJSBA General Competition Rules 2024; 2010 rule book; 2011 rule book; 2012 rule book; 2014 rule book; 2015 draft rule book; IJSBA rule book page; IJSBA Competition Membership 2024; UIM 2026 Aquabike rule book; IHRA rule book V.20260603

The UIM's three formats as the rules give them

Confirmed

Rule 317.01 of the UIM's 2026 Aquabike book, as our rule rows read it, defines a Jet Raid as several motos on different routes, each of at least 110 km, the whole race between 250 and 1500 km, with departure, refuelling and finish for each heat in different places. Rule 317.02 defines Offshore as a race at sea in several motos on different paths, each moto at least 110 km, with no total distance fixed and no requirement that start and finish differ. Rule 317.03 defines Endurance as a circuit of at least 3 km and at most 20 km, run as between 2 and 5 motos over at least 2 days, each moto between 30 and 180 minutes, with start, finish and refuelling in one place, and halves the time and the track for the Ski division; the same rule lets a venue post its own rule set in the advance program. Neither Jet Raid nor Offshore states how many motos it comprises. Rule 318 runs the procedure. Classification is by adding time or adding points across all runs (318.04). Each heat closes at the winner's time plus a third of it (318.05); a rider outside the limit is scored at twice the limit under time addition or disqualified from the heat under points addition, and a rider who withdraws the same (318.07). A checkpoint passed on the wrong side costs 2 minutes or 5 points, one missed by 10 to 50 metres 4 minutes or 10 points, and a missed buoy twice the limit time (318.06). Pit lane speed is 5 knots (318.08) and each rider has four badged assistants (318.09). A rider who breaks down on the course may repair alone and continue; once the start is given there are 15 minutes to repair and start before the rider counts as withdrawn (318.10). The craft goes into a closed pit within 5 hours of finishing (318.11). Before the first start a craft may be changed with a commissioner's authority for one of the same category and make; after the first start no change of craft, hull or engine is allowed (318.12). Refuelling uses homologated arm cans of at most 70 litres, unstrapped, two at once, by gravity only (318.13); the filler may be aftermarket but must sit on the hull surface (318.14); and the helmet is worn without a visor (318.15).

Sources: UIM 2026 Aquabike rule book

IHRA's endurance operations

Confirmed

Section G.7 of the IHRA book, version V.20260603, is the only place in the three current books where an endurance start is written step by step. G.7.1 lets Pro and Amateur run together unless the race instructions or the riders' meeting split them, allows staggered or alternate formats where field size or venue require, and has riders escorted single file from the wet pits to the alignment area under the Start Marshals, after which a pit closure signal bars anyone else from the course. G.7.2 sets race 1 by random draw or registration order and later races by the previous finishing order, and refuses a start without clear visibility over the entire course. G.7.3 aligns the field approximately 30 meters, printed as 30 yards in the same sentence, behind and perpendicular to the start boat, about 2 meters, printed as 6 feet, between craft, behind the marshals until the green flag, with the clock and lap 1 starting when the leader first crosses the line; riders hold their line until clear of the start boat, and a buoy missed on the start run is an automatic one-lap penalty that no penalty buoy can correct. G.7.4 keeps the Le Mans start the 2002 IJSBA book described, riders on foot at a set distance who run to the craft, connect the lanyard, start and enter the course, and G.7.5 adds a rolling start. G.12 allows one backup craft, only when the primary is unusable or unsafe by the Race Director's and Technical Director's judgement, through a four-step form; G.12.2 makes an endurance change cost last on the line for the next race plus a two-position penalty on the next finish, where a closed-course change costs last on the line alone, and once the fleet has left the launch area no change is allowed until the race ends. Four equipment rules bind endurance, three of them endurance alone. I.9 requires full-body waterproof clothing, a wetsuit or drysuit, at all times on the water, where closed course only recommends it; I.11 requires a whistle attached to the life jacket, functional and accessible, where closed course only recommends it; I.14 requires back protection in Ski and Endurance classes, no thicker than 45mm; and J.5 adds a towing rope on board of at least 5 meters (15 feet). C.1.2 admits solo riders or teams with one rider aboard at a time.

Sources: IHRA rule book V.20260603

The series and the races as documents

Confirmed

P1 AquaX is the series the IJSBA defers to, and its documents are corporate. p1aquax.com redirected the fetch tool to powerboatp1.com on 28 September 2026, whose home page says Powerboat P1 was founded in 2003 and has staged more than 200 events across 20 countries, brands the series the Monster Energy P1 AquaX Championship, lists five American rounds for 2025, and says the company sold its United States offshore racing operations to the IHRA while keeping AquaX. The British register entry for Powerboat P1 Management Limited, company 04591765, read the same day, gives incorporation on 15 November 2002, active status and two earlier names, the second held until 24 January 2007. Neither page gives the series' start, its formats or its rules. LB2CAT has a results page. The promoter's page at pwcoffshore.com, read on 28 September 2026, names the race the IJSBA Long Beach to Catalina and Back JetSki Race, 57 miles from the Queen Mary to Catalina Island and back; it lists a winner and make for every year from 1994 to 2018, prints 2019, 2020 and 2021 as cancelled, the second for COVID19, gives a record of 51:21 set in 2015, and tallies wins by make, Kawasaki 10, Yamaha 6, Polaris 4, SeaDoo 3, Honda 0. Havasu has one association post. The IJSBA's post of 11 February 2024 titles the event, behind two sponsor names, the 20th Annual Mark Hahn Memorial Havasu 300, calls it the IJSBA Team Endurance Nationals, sets it at 300 miles from Lake Havasu State Park on 24 February 2024 with seven classes at once, two riders per runabout team and up to three per stand-up, and prints a course record of 4 hours 46 minutes 13 seconds; one title thus carries both names the events record treats as an unsettled lineage. An IJSBA Endurance Nationals also appears in the 2010 book's calendar pages, on 3 and 4 July 2010. At the World Finals, the association's post of 25 September 2022 planned an Endurance Sprint of two motos of about 30 minutes, distance or oval, and said that in most years the category runs at the end of the final day; its schedule post of 10 October 2025 moved it to first on Saturday 11 October. The association's news index also titles an Endurance World Championship in Morocco in November 2017, one in Guadeloupe in May 2018 and a two-round one for 2019.

Sources: Powerboat P1 About page; Companies House 04591765; IJSBA Competition Membership 2024; LB2CAT race page; IJSBA Havasu 300 post 2024; 2010 rule book; IJSBA endurance plan post 2022; IJSBA 2025 schedule post 10 October; IJSBA news index for endurance

What the documents do not carry

Confirmed

A founding date for endurance as an IJSBA discipline. The 2002 book already has it fully formed, a numbered event type, a four-page section, team classes, an offshore hull allowance and models eligible for endurance only, so the discipline existed by 2002 at the latest; no earlier book is held, and the About page states no founding year for any discipline. A winner. The LB2CAT page prints one for each year from 1994 to 2018 and the 2024 Havasu post prints a record time; this chapter copies no name, and no result sheet of any body was read. An entry count. No page read gives one, checked on 2026-10-02 against the held rule-book texts as well; the 2022 World Finals post speaks of expected on-site entries without a number, and the figure unpublished notes attach to LB2CAT's end is in no document read. The Havasu race's founding. The co-promoters' own announcement, dated 20 March 2008 and held here, sets a fifth annual race for 28 February 2009 under APBA sanction and says it is run in memory of the racer its title names, who died during a race in 2004; like the 2024 post, it states no year of founding, and this chapter derives none from either. The P1 Aqua X rules. The IJSBA sends its riders to them and no page read carries them, checked on 2026-10-02, when the held Competition Membership text's MEM.15.1 still only referred an endurance rider to the General Competition Rules and the P1 Aqua X Rules, so what an IJSBA endurance race is run under today cannot be read from the IJSBA's own documents, and neither the 2022 plan nor the 2025 schedule post says which rules the World Finals endurance uses. Whether the Havasu 300 and the Mark Hahn Memorial 300 were ever two events. The 2024 title joins the names; nothing read says when, checked against the rulebooks and the press archive held here on 2026-10-06, and the earliest held trace of the memorial name is a run of page titles in Personal Watercraft Illustrated's archived web listing, the first captured in January 2008, which use it without Havasu, while the co-promoters' release of March 2008 already prints the two names as one title. The point of the 2002 book's Driscoll start, whose name the book does not explain. Which starts the races used. The one race instruction held, the IJSBA's rules for the Havasu race of 12 February 2017, has runabout riders run to their held craft at the gun and flag, which it calls the Le Mans start, and gives stand-ups a separate flag start two minutes later; no instruction for any other race or year was found (searched the archive's mirror and research cache, 2026-10-09).

Sources: 2002 rule book; IJSBA About page; LB2CAT race page; IJSBA Havasu 300 post 2024; Mark Hahn 300 announcement 2008; Mark Hahn 300 rules 2017; IJSBA endurance plan post 2022; IJSBA 2025 schedule post 10 October

Not covered, and why (5)

The names of any rider, title holder, hall of fame inductee, navigator, promoter or freeride figure in the endurance and offshore section of notes not published here.
This archive names a person only for a public role that a document records, with a Key Figures record behind the name; this chapter names only Mike Follmer, as the Havasu race's co-promoter. The LB2CAT page and the Havasu post print names; none is copied, and the manufacturer tally and record times are printed without the riders who set them.
The Mark Hahn Memorial 300 was founded in 2004 by a named rider and is promoted by two named companies.
The 2004 founding came from unpublished notes, and the race's own release contradicts it: the co-promoters' announcement of 20 March 2008, held here, makes the 2009 race the fifth annual and puts the death the race commemorates in 2004. That release names its co-promoters as two people, Mike Follmer and the owner of DSM Events, rather than as two companies. The association post of 2024 names no promoter.
Any "first" for an offshore race or its people, including the first promoter inducted into a hall of fame, the first inductee, the originator of the LB2CAT concept, or the world's longest PWC race.
Each is a superlative of a promoter or of notes not published here. The 2024 post calls the Havasu race the world's longest and most grueling personal watercraft endurance race in its own words, which is a claim, not a measurement; no document read compares distances.
LB2CAT was cancelled indefinitely after 2019 because entries had shrunk to roughly 20 racers, even as supercharged craft had halved course times.
The entry figure and the cause come from unpublished notes quoting a trade writer; the race page read prints the cancellations and the record times and states no reason and no entry count.
A rider finished the 2017 Mark Hahn 300 on a broken leg, another has made more than 1,200 Catalina crossings, another 6,000 offshore miles.
Hall of fame citations relayed by unpublished notes from a promoter's site not read here; they name people and are unverifiable from any held document.

What could not be read (8)

  • The P1 Aqua X Rules the IJSBA membership document defers to were found on no page read. p1aquax.com redirects to powerboatp1.com, whose About address returned 404 and whose home and AquaX pages gave the fetch tool the company's founding, a calendar and a sponsor name, and nothing on formats, the series' start or its rules.
  • No IJSBA book between 2002 and 2010 is held here in English; the capture index lists English 2003 to 2009 books, including the whole 2006 book, cached locally and not read for this chapter, so the endurance part is compared across 2002, 2010, 2011, 2012, 2014 and the 2015 draft only; the 2016 text in the jetski.cz file was not compared line by line.
  • The LB2CAT page read on 28 September 2026 prints 2019, 2020 and 2021 as cancelled and its last result as 2018; our events record says results from 1994 and cancelled indefinitely after 2019. The chapter prints the page's wording and leaves the record to be corrected by its owner.
  • Neither the 2024 post on the Havasu race nor the co-promoters' release of 20 March 2008 prints a founding year. The post gives 20th Annual, twenty consecutive years, a 20th year and a death in 2004; the release calls the 2009 race the fifth annual after four previous years. The two counts agree, and the chapter prints them as counts, not as a founding year.
  • The 2025 World Finals schedule post carries its times and classes in an image the fetch tool cannot read; only the sentence that endurance runs first is held.
  • No endurance result of any body was read, so nothing here says who won, how many entered or how many finished, at any race in any year.
  • The IHRA rules page refuses the fetch tool, so the IHRA book is cited from the text held here and its version string, V.20260603.
  • Our Wayback capture index, which is not evidence, records that nothing on ijsba.com predates 2000; the sixth section no longer rests a sentence on it.

People on record (12)

Each has a page on Key Figures, named for a public role a document records.

Documents cited in this chapter

  • 2002 rule book (web.archive.org): IJSBA 2002 Official Competition Rule Book, International Jet Sports Boating Association, 2002; sanctioning body, high. The complete 2002 book in 25 sections, the oldest full IJSBA rule book held here, served from a Norwegian club's document server and captured by the Wayback Machine. Four numbered technical parts (Stock, Limited, Superstock, Modified), three divisions, the 500 and 200 unit homologation figures, and the United States class list.
  • IJSBA General Competition Rules 2024 (ijsba.com): IJSBA General Competition Rules (GEN), 2024 document linked from the rule book page, International Jet Sports Boating Association, 2024; sanctioning body, high. The current general rules, GEN.1 to GEN.15, held here as extracted text and read from it; the archive's own rule rows (racing-rules, ijsba-2025-*) were extracted from the same text. Added 2026-09-30 during the source check, because the endurance and World Finals chapters read GEN.6, GEN.7 and GEN.9 through those rows and cited only the rule book page, which links the document and prints none of its text. The page URL is the public address; the PDF itself sits behind it.
  • 2010 rule book (web.archive.org): IJSBA 2010 Official Competition Rule Book, International Jet Sports Boating Association, 2010; sanctioning body, high. The complete 2010 book, kept by the Czech affiliate after IJSBA removed it. Part 8 is headed Open Class with Superstock as an addendum; the Stock part carries the Lites and class naming addenda; part 4 prints the 500 unit figure without a Ski exception and the 100 unit route below it; the appendix adds Special Production homologation below 100 units.
  • 2011 rule book (web.archive.org): IJSBA 2011 Official Competition Rule Book, International Jet Sports Boating Association, 2011; sanctioning body, high. The complete 2011 book from the Czech affiliate's server. Repeats the 2010 Lites addendum (85 and 220 horsepower) and the class naming addendum, and its competition classes appendix still prints 500 (200 for Ski Division) while its part 4 prints 500 flat.
  • 2012 rule book (web.archive.org): IJSBA 2012 Official Competition Rule Book, International Jet Sports Boating Association, 2012; sanctioning body, high. The complete 2012 book. Its Lites addendum redefines Runabout Lites as four-stroke naturally aspirated Stock runabouts under 2000cc, and its Ski sponson rule is dated to itself, as of 2012, for the four-sponson allowance on Lites-eligible Ski.
  • 2014 rule book (web.archive.org): IJSBA 2014 Official Competition Rule Book, International Jet Sports Boating Association, 2014; sanctioning body, high. The complete 2014 book. Runabout Lites is renamed Runabout Rec Lites in the addendum, and the class list adds Vintage Ski (JS type hulls only, 550cc maximum), Sport GP and Runabout 1000 Superstock.
  • 2015 draft rule book (web.archive.org): IJSBA 2015 Official Competition Rule Book (draft), International Jet Sports Boating Association, 2015; sanctioning body, high. A draft, as its file name says, so cited only where it repeats earlier books. Its class list is the 2014 list unchanged, Vintage Ski included.
  • IJSBA rule book page (ijsba.com): IJSBA Competition Rule Book (the current per-class documents), International Jet Sports Boating Association; sanctioning body, high. The live page, read on the accessed date. It links no single book but per-class PDFs dated 2021 to 2025, twenty of them class documents, plus general, competition and appendix documents. The class and body records on this site were read from these PDFs on 2026-09-07; the chapter's figures for the current set come from those records and from the page itself, not from a re-reading of the PDFs.
  • IJSBA Competition Membership 2024 (ijsba.com): IJSBA Competition Membership (MEM), 2024 document linked from the rule book page, International Jet Sports Boating Association, 2024; sanctioning body, high. The current membership document, held here as extracted text and read from it. Its opening states it to be the policy in the United States and the suggested model for affiliates; MEM.1.1 says the association does not test the skill of participants; MEM.12 to MEM.17 define the event types, and MEM.15.1 sends endurance competitors to the General Competition Rules as well as P1 Aqua X Rules. The address is the one the rule book page linked on the accessed date.
  • UIM 2026 Aquabike rule book (uim.sport): UIM Aquabike Rulebook 2026 (published 22 December 2025), Union Internationale Motonautique, 2025-12-22; sanctioning body, high. The single 189-page UIM book that covers every class in one season. Rule 500.02 is its homologation article (50 specimens for the production classes, a logbook for GP1 prototypes) and rule 312 its freestyle discipline (five judges, ten criteria, 300 points). Cited here as the body and class records on this site read it, taken from the PDF on 2026-09-08, not from a re-reading of the PDF; the 2005 and 2006 Hungarian translations of earlier UIM books held here were not read.
  • IHRA rule book V.20260603 (ihra.com): IHRA Pro Watercraft Racing Competition Rulebook, version V.20260603, International Hot Rod Association, Pro Watercraft Racing, 2026-06-03; sanctioning body, high. The 95-page book, sections A to EE, held here as extracted text and read from it for this chapter. B.7 is the homologation bar (300 identical units, an established distribution network reaching the global market); C.1.3 the freestyle overview; H.1 to H.7 the freestyle operations; I.10 and J.6 the freestyle exemptions; CC the freestyle technical rules, whose CC.1 prints the one open-list sentence in the document. The public address is the rules page, because the PDF is served from an expiring signed link; the version string is the date to cite.
  • Powerboat P1 About page (powerboatp1.com): Powerboat P1 home page and AquaX page (powerboatp1.com, where p1aquax.com redirects), Powerboat P1 Management Limited; editorial, medium. p1aquax.com and its about path both returned a 301 to powerboatp1.com on the accessed date; the About address there returned 404, so the home page and the AquaX page were read instead. They give the company's founding in 2003, more than 200 events across 20 countries, the Monster Energy P1 AquaX Championship name, a 2025 calendar of five American rounds and the sale of the company's United States offshore operations to the IHRA. Nothing on AquaX's start, formats or rules was on the pages read. Medium as a promoter's own site.
  • Companies House 04591765 (find-and-update.company-information.service.gov.uk): Powerboat P1 Management Limited, company 04591765 (Companies House register entry), Companies House, United Kingdom; government, high. Read on the accessed date. Incorporated 15 November 2002, active, a private limited company with a London registered office and activity code 93199, with two previous names, the second held until 24 January 2007. Officer names on the entry are not copied.
  • LB2CAT race page (pwcoffshore.com): The IJSBA Long Beach to Catalina and Back JetSki Race, LB2CAT (the promoter's own race and results page), RPM Racing Enterprises, on pwcoffshore.com; editorial, medium. Read on the accessed date. The 57-mile course from the Queen Mary to Catalina Island and back, a winner and make for every year 1994 to 2018, cancellations printed for 2019, 2020 (COVID19) and 2021, three record times and a tally of wins by make. Medium as a promoter's own page; the riders it names are not copied.
  • IJSBA Havasu 300 post 2024 (ijsba.com): IJSBA Team Endurance Nationals, Mark Hahn 300 Is On For February 24 (IJSBA post, 11 February 2024), International Jet Sports Boating Association, 2024-02-11; sanctioning body, high. Read on the accessed date. Titles the 2024 event the 20th Annual Mark Hahn Memorial Havasu 300 behind two sponsor names, calls it the IJSBA Team Endurance Nationals, 300 miles from Lake Havasu State Park, seven classes at once, team sizes, solo entries and a course record. The event's title carries a person's name as the association prints it; no other person is named here, and no founding year is printed in the post.
  • IJSBA endurance plan post 2022 (ijsba.com): IJSBA Posts Endurance Plan For 2022 Jettrim WGP-1 World Finals (IJSBA post, 25 September 2022), International Jet Sports Boating Association, 2022-09-25; sanctioning body, high. Read on the accessed date. An Endurance Sprint of two motos of about 30 minutes in distance or oval format with refuelling not a factor, the sentence that in most years the category runs at the end of the final day, and the reasons for the timing. Names no rule set and no class.
  • IJSBA 2025 schedule post 10 October (ijsba.com): 2025 SBT World Finals Schedule, Saturday October 11, Note Endurance Before Practice (IJSBA post, 10 October 2025), International Jet Sports Boating Association, 2025-10-10; sanctioning body, high. Read on the accessed date. The one sentence held is that the Endurance event runs first to allow score tabulation during practice; the times and classes are in an image that could not be read as text.
  • IJSBA news index for endurance (ijsba.com): ijsba.com search results for endurance (post titles and dates only), International Jet Sports Boating Association; sanctioning body, medium. The association's own site search, read on the accessed date for its titles and dates alone. It lists the 2017 Endurance World Championship results from Morocco (16 to 20 November 2017), Karujet in Guadeloupe as the Endurance World Championship of 10 to 13 May 2018, a two-round 2019 championship in Indonesia and Morocco, the 2018 LB2CAT as an Offshore Endurance National Championship, and the three posts held as their own rows. Medium because only titles were read.
  • IJSBA About page (ijsba.com): About IJSBA (the association's own description of itself on ijsba.com), International Jet Sports Boating Association; sanctioning body, high. Calls the association the worldwide sanctioning body for personal watercraft competitive racing, repeats the 2002 book's four IJSBA Control clauses, gives three reach figures (more than 50 countries, more than 43 affiliated countries, over 200 clubs and promoters), and dates the World Finals to every year since 1982 at Lake Havasu City. No address and no founding year for the body. (as IJSBA rule book page above)
  • Mark Hahn 300 announcement 2008 (web.archive.org): Fifth Annual Mark Hahn Memorial Havasu 300, announcement of 20 March 2008 (pwcoffshore.com, Wayback capture), pwcoffshore.com, 2008-03-20; editorial, high. The race's own announcement, headed as issued from Mike Follmer of Team Yamaha, setting the fifth running for 28 February 2009 at Lake Havasu and naming its co-promoters. High for what the event said of itself and who it named; one sentence can be read two ways about who held the title Executive Producer, so no page uses that title (checked 2026-10-06).
  • Mark Hahn 300 rules 2017 (ijsba.com): 13th Mark Hahn Memorial 300 Race Rules (IJSBA page), International Jet Sports Boating Association, 2017-01-20; sanctioning body, high. The rules for the race of 12 February 2017, as of 20 January 2017, with its classes, the race committee and three contacts. The held copy has the contacts' email addresses removed.

Changes to this chapter

  • 2026-10-09: Corrected 2026-10-09: the chapter said the 2008 press release on the Havasu race's founding and promoters was not located; it is held, as the co-promoters' announcement of 20 March 2008, and is now cited. It gives a fifth running in 2009 and a death in 2004, names two people as co-promoters rather than two companies, and prints no founding year.
  • 2026-10-09: Corrected 2026-10-09: the chapter said no race instruction from any year was held; the IJSBA's 2017 rules for the Havasu race are, and now give that race's starts. The naming reason in the held-back claims now states the archive's rule for naming people instead of an internal plan step, and unpublished notes are called that.
  • 2026-09-30: Source check against the held books: the 2002 list marks two runabouts endurance-only, not several; the UIM's 394 cm allowance is for Endurance alone; the current general rules name endurance once and are now cited as their own row; the membership document's definition is three sentences; the IHRA endurance class is four-stroke; the withdrawal rule is 318.07; four equipment rules, three of them endurance-only.
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“Endurance and offshore, by the rule book”, BaddJet archive, https://baddjetarchive.com/racing/history/endurance-and-offshore/

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