Jet Boat Base is a boat builders on Main North Road in Belfast, Christchurch, specialising in jet boats going by the name. Jet propulsion is a New Zealand invention, developed to handle the country's shallow, braided rivers where a standard propeller would foul on gravel within minutes, so a builder working in this space needs expertise in impellers, intakes and jet units rather than the outboard or sterndrive knowledge that suits a boat with a propeller. Building or servicing a jet boat means understanding how hull design and water flow interact, since a poorly matched hull and jet unit can leave a boat underpowered or hard to handle even with a good engine. Custom jet boats are common for river access into New Zealand's high country for fishing and hunting, so a builder in this trade often handles servicing and repairs for boats already on the water alongside new builds. On Main North Road in Belfast, Jet Boat Base is a specialist in that boat building trade.