Complacency is at the root of too many shipping accidents, according to P&O Ferries' safety chief Grant Laversuch.
Writing in the UK Marine Accident Investigation Branch's latest safety digest, he said "the C word" is an easy way to explain a multitude of errors away.
"But if we really understood what complacency was, it wouldn't exist," he added.
Laversuch said the best definition of complacency is "when we feel comfortable with something and start to let our guard down."