maritimeshipping.org
Classification societies, trade associations, regulatory bodies and research organisations in shipping are overwhelmingly .org, and there are a great many of them. This is the exact term on their extension.
Maritime shipping moves roughly ninety percent of world trade by volume, making it the least visible and most essential industry in the global economy, currently working through decarbonisation rules, route disruption and a fleet renewal problem simultaneously.
The name suits an industry association, a standards or safety organisation, a research institute, an education and training provider, or a publication covering policy and regulation. Training deserves separate mention: seafarer certification is a large, internationally regulated market.
Two words, no hyphen, exact phrase, no regional spelling variation, naming an industry that cannot be replaced by anything.
Enquiries welcome.