Around the world, recreational vessels are recognised as a significant pathway for the inadvertent spread of marine non-indigenous species. Understanding these vessels' movements and domestic connections is important for effectively managing border and post-border (domestic) biosecurity risk. New Zealand has a resident population of >15,000 permanently moored sailing and motor yachts, domiciled in coastal marinas and moorings areas. Due to the absence of registration and AIS requirements, the voyage characteristics of these vessels are not well understood. Route and destination data were collected through an online map-based survey of recreational boat owners. Data from 1,800 individual respondents, including over 12,000 destinations, were used to create a national recreational vessel transport network across New Zealand. Network-based centrality measures and the degree distribution helped characterise spread dynamics within the network. This analysis also revealed a suite of invasion hubs, higher-risk sites, and several high-use boating corridors. These sites and corridors highlight potential opportunities for targeted management actions to reduce spread and risk. These findings illustrate how marine invasive species might spread domestically through the New Zealand recreational boating network. They also provide a vital tool to support invasive species monitoring and management once an incursion is detected.