"It comes with a tank of gas and the trailer is warranted, so basically as soon as you win it you can put it in the water and go boating."
The winner would be broadcast live via Facebook, he said.
The show begins today at 10am and runs until Sunday. Entry costs $20 and is free for kids 16 and under.
Boat lovers can sail the seven seas or at least drive out to Greenlane to check out the range of new GRP and aluminium trailer boats and luxury launches, as well as a display of old outboard engines - including the only outboard engine ever to be made in New Zealand.
Boats big and small will be on display, including a squadron of model boats which can be raced in a mini man-made lake.
Free fishing seminars will teach people how to cast off and a range of fishing gear will also be on sale.