Sales in the international boat markets had dropped by about 30 per cent since the 2008 global financial crisis and turnover in the New Zealand market had fallen by about the same percentage, he said.
He said the local boat building industry was steady and had stopped declining, post the crisis.
"It has stopped dropping, so hopefully we are looking at this show as being something of a turning point," he said.
The industry has a turnover of about $1.7 billion a year, with exports accounting for about $650m of that.
He said businesses' ability to develop new products was helping to keep the marine industry ticking over.
Busfield, who has been in the marine business since the share market crash of 1987, has seen a few market downturns since then.
Each time, the industry appeared to be a leading economic indicator for what later unfolds by going quiet about six months before the rest of the economy, he said.
The boat building and marine supplies industry is New Zealand's largest manufacturing sector, accounting for 10 per cent of the country's manufactured goods.
The show, formerly the Auckland International Boat Show, is one of the main events on the domestic marine calendar.