"This chap's a guy who's been boating most of his life, he's in and out of the marina a number of times. He got confused and made an error of judgment."
Butson allegedly aimed his boat around the wrong side of a lateral light at the entrance to the marina, only spotting the breakwater wall a split second before crashing into it.
"Had he been doing his correct speed I believe he would have picked up his mistake ... because he was going approximately 19 knots, everything happened so fast and with his loss of situational awareness and all the background lights he wasn't able to react in time."
All three on board were injured and taken to hospital after the crash, with at least one suffering a broken nose and another a fractured arm.
Main said it was a good reminder that even experienced, well-equipped boaties needed to be more aware.
On the police boat, they would peer review their actions and decisions, he said.
Butson refused to comment on the incident, but told the Herald "I did nothing".