As the 175-metre vessel rolled in heavy swells, Li decided to change direction, manoeuvring the large ship close to Portland Island.
“This change in route took the vessel close to shallow water, passing two spots with depths of 9.4 and 10m,” Maritime NZ investigations manager John Maxwell said.
The planned route was supposed to take the ship around Portland Island, leaving enough clearance for anticipated heavy weather.
“This is very shallow for a bulk carrier of this size, and would have only left it with a couple of metres of clearance between the vessel and a potential grounding.
“The decision of Captain Li to alter course without further assessment of whether the route was safe put the crew, vessel, and the environment at risk.
Li was fined $1875 for the breach, which included a 25 per cent sentence discount for an early guilty plea.
The skipper is not the first from the Spinnaker to be charged.
In March 2019, then-captain Jianxi Chen was prosecuted by Maritime NZ after directing his crew to lash down a cargo of logs without adequate protective equipment.
Chen pleaded guilty and was fined $6000 at the Timaru District Court.