Rulebook reference
UIM
Union Internationale Motonautique. Europe, the Gulf and the UIM national authority network. The 2026 rulebook, published as one 189-page PDF, published 22 December 2025. Homologation at 50 units, sound measured at 24 m.
8 of these classes cannot be answered at all: the rulebook recognises them and gives them no component rules, and names no single class for them to inherit from. Their pages say so rather than rendering an empty list, which would read as no restriction.
runabout
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Has its own rules · 502.01 · 2026 rulebook · 4 open questions
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Has its own rules · 502.02 · 2026 rulebook · 6 open questions
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Has its own rules · 502.03 · 2026 rulebook · 6 open questions
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Has its own rules · 502.04 · 2026 rulebook · open class · 4 open questions
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Discipline · 317.01 · 2026 rulebook · 1 open question · no component rules and no parent class named
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Discipline · 317.02 · 2026 rulebook · no component rules and no parent class named
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Sporting class · 302.01 · 2026 rulebook · 1 open question · rules from Runabout GP4
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Sporting class · 302.01.01 · 2026 rulebook · 1 open question · rules from Runabout GP4
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Sporting class · 302.01.05 · 2026 rulebook · 2 open questions · rules from Runabout GP1
ski
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Has its own rules · 501.01 · 2026 rulebook · 4 open questions
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Has its own rules · 501.02 · 2026 rulebook · 3 open questions
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Has its own rules · 501.03 · 2026 rulebook · 4 open questions
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Has its own rules · 501.04 · 2026 rulebook · open class · 3 open questions
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Sporting class · 302.01 · 2026 rulebook · 1 open question · no component rules and no parent class named
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Sporting class · 302.01 · 2026 rulebook · 2 open questions · rules from Ski Division GP3
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Sporting class · 302.01 · 2026 rulebook · 2 open questions · rules from Ski Division GP3
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Sporting class · 302.01 · 2026 rulebook · 1 open question · rules from Ski Division GP4
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Sporting class · 314 · 2026 rulebook · 2 open questions · rules from Ski Division GP1
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Sporting class · 302.01.05 · 2026 rulebook · 2 open questions · rules from Ski Division GP1
multi
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Discipline · 317.03 · 2026 rulebook · no component rules and no parent class named
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Discipline · 313 · 2026 rulebook · 1 open question · no component rules and no parent class named
freestyle
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Discipline · 312 · 2026 rulebook · no component rules and no parent class named
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Discipline · 312 · 2026 rulebook · 2 open questions · no component rules and no parent class named
hydrofly
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Discipline · 900 · 2026 rulebook · 3 open questions · no component rules and no parent class named
Read the 2026 rulebook · Where the rulebooks differ · Checks on parts the shop sells
Classes are one way in. To start from the part instead, and see how many classes answer it, legality by part lists every part any of the three rulebooks addresses.
24 classes · 8 with their own rules · 2026 rulebook