New zealand Boat marathon commission

An overseeing body that coordinates and promotes responsible boating, allowing boating clubs to organize and run events involving a series of nominated speed time trial and speed race events that all boat owners can be a part of.




All boats and competitors must meet regulations.

Get Involved

Ways to get involved

About our Events

The events are composed of two primary segments: a nominated speed time trial and a speed race. Depending on the hosting club, these may be combined into a single race or separated into two distinct races.

All boats, regardless of their class, begin the race simultaneously in a rolling start format, under the supervision of the start boat. Each class is then required to complete a specific number of laps based on the length of the course. Faster classes must complete more laps than slower classes, resulting in most classes finishing the race around the same time. The distance covered by the faster classes is approximately 100km, while the lower classes cover roughly 60km. Due to the lower number of laps required, boats in lower classes have a chance to win first place honours.

Cabin boats are allowed to compete in classes two levels below their designated engine rating. Boats with engines modified beyond the manufacturer’s specifications and specific race boats must compete in a class one level higher than their designated engine rating. This ensures that there is tight competition within each class, as a cabin boat with a 200hp engine will compete in the same class as a runabout with a 135hp engine.

Before each event, all boats undergo scrutiny to ensure they meet safety standards and have the necessary equipment on board. A list of requirements is available for reference. Safety boats with divers and paramedics on standby are present on the course and at the shore during each event.

Nominated Speed

In this race, participants are required to choose a target speed before the race begins, and strive to maintain it as closely as possible throughout several laps. The race typically spans a total distance of approximately 50 kilometers, with the course being measured by officials using GPS equipment. Based on the nominated speed of each competitor, a lap time calculation is performed, and points are awarded according to the performance of each boat during the race. The competitor with the lowest number of points at the end of the race is declared the winner. The key to success in this race is maintaining a consistent speed. Fishing and cabin boats tend to be strong contenders in this highly competitive event, making it an excellent choice for those seeking to get involved. Note that the use of GPS equipment is strictly prohibited during the race.

Speed Race

Categorizes boats into seven classes based on their engine size and hull configuration. These classes are tailored to accommodate a variety of boats, ranging from fishing and leisure craft to runabouts, ski boats, and specialized racing vessels. By dividing the boats in this manner, the race offers an inclusive platform for boat owners who may not have otherwise participated, and allows for thrilling and competitive racing within each class.

Event Calendar

These are our events for this year.


Classes are defined based on hull configuration and engine size. This ensures competitive racing between similarly configured boats.

Engine manufacturer catalogues are used to define standard engines and their maximum prop rated horsepower

A Class - V (Vee/Mono hull)

Mono hull craft with single engine configurations not eligible for B Class or lower, multi engine configuration up to and including 400hp

A Class - T (Tunnel)

Tunnel hull craft with single engine configurations not eligible for B Class or lower, multi engine configuration up to and including 400hp.

A Class Multi - (Twin/Triple Rig)

Multi engine craft with combined horsepower greater than 400hp

B Class

Mono hull outboards up to and including 225 HP or 4 stroke inboards 5081cc to 6560cc

C Class

Mono hull outboards up to and including 200 HP or 4 stroke inboards 4351cc to 5080cc.

D Class

Mono hull outboards up to and including 150 HP or 4 stroke inboards 3031cc to 4350cc.

E Class

Mono hull outboards up to and including 150 HP or 4 stroke inboards 3031cc to 4350cc.

F Class

Mono hull outboards up to and including 90 HP or 4 stroke inboards up to 2550cc.

G Class

Unrestricted hull and engine size but must meet all NZBMC scrutineering requirements. Drivers must be 50 years of age or over.

Standard Boat Class – B to F Class. Any outboard engine which is non-standard by definition is required to enter one class up provided they still meet the newly clarified rules for 2023 season adopted at the February AGM.

Cabin boats are eligible to enter Two class down from their designated engine rated class provided engines are standard and run at standard class height.


NZBMC rules are in place to ensure the safety of all competitors, all boats and competitors must meet regulations set out by NZBMC to compete.  

Download rule book here.


Regular competitors will be issued a log book for scrutineering. One off entries will be scrutineered via the single use scrutineering form.

Download scrutineering form here.


2023 Season Prizegiving online entry form.

Get Involved


With 9 different classes to compete in there is a class to suit your boat parked in your garage, whatever the configuration, as long as it meets the minimum safety requirements. Typical family boats – run abouts, ski boats and cabin boats feature regularly and often have close racing with others due to the race setup.


If racing is not for you we are always looking for pick up boats on course. Boats are positioned around the course displaying flags to indicate to drivers current race status, as all motorsport events do. They are also there to give assistance to any boat that should require it. This is an awesome way to get up close and personal on course with the boats as they are competing.


Come along and watch, all events are free entry with open pits. Everyone is free to wander around and drivers are only too keen to talk to anyone interested. If you think you may like to get involved but not convinced yet come along and talk to the members who will offer any advice they can to assist you.