What I learned about maritime law for a boat scene
A boat scene can look simple: a hull, a flashing light, a line cut across the water. Yet the instant a character reaches the helm, the reader starts asking who is in control, what the boat must carry, and which rule governs the next move. A maritime-law question can therefore become a character question.
Before I can make a character lie convincingly, I need to know the physical and legal limits around them. A person may know how to throw a line but not how to handle a radio call; a skipper may be competent at sea but unfamiliar with a particular Australian harbour. Research prevents small errors from making the whole story feel invented.
The surprise was how quickly technical detail becomes dramatic. A navigation light, a channel marker or a refusal to answer a VHF call can reveal intention. The aim is not to turn a thriller into a manual; every dangerous choice should have a consequence that belongs to the setting.
For a crime novelist, that research also keeps local colour honest. Sydney, Melbourne and the Queensland coast are not interchangeable versions of the sea, and the Australian market for private, commercial and hire boats has its own practices. A credible scene begins with those differences, then decides which one matters on the page.
The map begins with jurisdiction
My first lesson was that maritime law is attached to a place. Depending on location, a state or territory law, a Commonwealth law, the law of a foreign flag state, or an international convention such as the United Nations Convention on the Law of the Sea may apply. Collision Regulations (COLREGs) are only part of the map. A chase therefore needs a position, a vessel status and a question about coastal or port-state authority before it needs a dramatic speech.
In practice, a scene set in Sydney Harbour cannot borrow the atmosphere of an open-ocean crossing. Harbour channels, local notices, speed controls and port directions change what a sensible skipper would do. The same applies around Port Phillip Bay or off Queensland. The official background page for Heine Bakkeid is a reminder that credible settings come from specific places, not generic nautical scenery.
Rules become visible through choice
The second lesson was to let rules appear as decisions rather than lectures. A character may slow because another vessel is hidden behind a bend, display navigation lights at dusk, answer a radio call, or keep clear of a commercial channel. Those actions can reflect COLREG requirements and Australian maritime-safety rules without stopping the conversation. The useful question is what the character knew, what they ignored, and what risk they accepted.
I found it useful to hold each dramatic question beside its hidden obligation:
| Dramatic question | What the reader sees | What the writer verifies |
|---|---|---|
| Who is in charge? | helm, crew and passenger briefing | competence, licence and authority |
| Which vessel yields? | lights, course, wake and sound signal | Collision Regulations and right of way |
| What is ready? | lifejackets, flares, VHF and AIS | carriage, maintenance and communications |
| Who carries the risk? | charter, insurance and instructions | contract terms, consent and exclusions |
This made revision more precise. If a chase depends on a reckless turn, I could ask whether I meant an intentional breach, a misunderstanding, or an emergency exception. An automatic identification system (AIS) can provide traffic context, but it does not replace a lookout or give a vessel automatic priority. The writer should know whether the boat has a working radio, safety equipment and an authorised person at the helm.
Australian waters change the stakes
Australian waters give ordinary objects legal weight. A VHF transmission on Channel 16, a Mayday or Pan-Pan call, lifejackets, flares and a duty to remain at the scene can determine whether a rescue is plausible. Australian rescue coordinators and maritime authorities use established procedures; inventing a private distress code would make the emergency feel false. The danger is emotional, but the response is procedural.
Customs and biosecurity can be as important in a thriller as a collision. Australian Customs and Border Force controls apply at the border, while biosecurity rules can restrict untreated timber, soil, food, plants and animals. A skipper who declares—or conceals—cargo may create consequences beyond the harbour. Environmental duties add another layer: oil, sewage, garbage and fuel cannot be treated as interchangeable plot props, and international MARPOL principles may shape how a coastal scene ends.
Checks that keep the scene credible
The best research is layered. I used Australian Maritime Safety Authority material, current Notices to Mariners, state and port guidance, and accounts from people who work on the water. I also used a broader maritime law perspective as a secondary prompt, while checking any point that affects the Australian setting against current official guidance. A law can set the boundary; a local habit supplies the texture.
Plot checks
- Is the boat in Australian coastal water, a port or inland waters?
- Who commands it, and do they hold the relevant licence?
- What instruction, deadline or hazard creates the first wrong turn?
Prose checks
- Can the viewpoint character see or hear the danger in time?
- Does every technical detail change a decision?
- Which rule raises the cost of deception?
A useful scene keeps the narration and the legal notes in view without making either one lecture. That distinction matters in the Australian recreational and charter market, where a hire agreement, skipper’s instructions and insurance conditions can shape the outcome as much as a collision. The boat must also belong to a believable operational setting: a private run, a commercial voyage, a charter or a search-and-rescue call.
The detail that stays with the reader
For a crime novel such as the Norwegian Thorkild Aske series, that precision can sharpen suspense. When a character cuts across a channel, ignores a restriction, takes a passenger somewhere unapproved, or fails to answer a distress call, the breach reveals motive. The Thorkild Aske books gain force when the sea becomes a working system with rules that resist a convenient lie.
The lesson is simple: locate the vessel, identify the controlling rule, and let one accurate detail alter the character’s next choice. A law does not need to be explained in full to be felt; it only needs to be specific enough that the reader remembers the risk after the engine goes quiet.