A rubber stamper is the person in a office telling you how to be safe, how to do your job, by signing and rubber stamping papers...
No actual safety is done, but lots of paperwork is stamped.
Them having ever been on a vessel, or knowing which side of a hammer is for flattening fingers, is irrelevant.
As long as the permit procedure is as long, tedious and not relevant, as possible... They are happy.
Companies from the UK are notorious for paperwork over real safety, hence rubber stamping and the need to hire a rubber stamper stamp rubber.