When you're booking a Komodo liveaboard, you probably aren't thinking about Harbor Master paperwork. But every boat that leaves Labuan Bajo for the park needs one: a Sailing Approval Letter, known in Indonesia as a Surat Persetujuan Berlayar (SPB). It's issued fresh for every single departure, whether it's a three-night liveaboard or a returning charter, after the boat's documents and condition check out on that specific day.
TL;DR
- The SPB is issued per departure, not per boat or per season, by the Labuan Bajo Harbor Master.
- To get one, an operator must show a valid Passenger Safety Certificate, a Safe Manning Certificate, and proof of current tax compliance.
- The SPB sits alongside other required documents: NCVS/BKI classification, KKPRL marine zoning permits, and SiORA passenger registration.
- No SPB means no legal departure. It is the last independent checkpoint before a boat leaves the dock.
- Hello Flores only lists boats from operators contractually required to hold current insurance and certification, and can request documentation from the operator on a guest's behalf.
About the author: Hello Flores helps travellers book Komodo liveaboard and charter trips with vetted partner operators. That experience means routinely fielding questions about how Komodo departures are actually cleared to sail, not just how they're marketed.
What Does the Sailing Approval Letter Actually Cover?
The SPB confirms that a specific vessel, on a specific day, with a specific crew and passenger count, has met the conditions the Harbor Master requires to leave port. Think of it less like a driver's license and more like a pre-flight clearance from air traffic control: a pilot's license doesn't get a plane off the ground on its own, someone still has to confirm that this aircraft, today, with this crew and this manifest, is fit to depart.
To issue the letter, the Harbor Master checks three things. Vessels departing Labuan Bajo for Komodo National Park must present a valid Passenger Safety Certificate, a Safe Manning Certificate, and proof of compliance with local tax payments. None of these are static documents that get filed once and forgotten. The Passenger Safety Certificate reflects the boat's current safety equipment and condition. The Safe Manning Certificate confirms the crew on board that day is qualified and sufficient for the vessel's size and passenger count. Tax compliance confirms the operator is current with its obligations, not just registered somewhere on paper.
Quick answer: the SPB is the day-of checkpoint. Everything else, from classification to zoning permits, is groundwork that has to be in place before that checkpoint can pass.
How Does the SPB Fit With Indonesia's Other Maritime Requirements?
The SPB is the final gate, but it sits on top of a stack of standing requirements a vessel has to meet long before departure day. Liveaboard vessels in Komodo must comply with Indonesia's Non-Convention Vessel Standard (NCVS) under Ministry of Transportation Regulation 65/2009, and they are required to hold classification from Biro Klasifikasi Indonesia (BKI), the national body that inspects and certifies vessel construction and safety systems. That classification is what the Passenger Safety Certificate is actually built on.
Separately, commercial sailing operators in Komodo National Park must hold a KKPRL permit, which governs where and how a vessel is allowed to operate within the park's marine zones. This is a park-level requirement, distinct from the harbor-level SPB, and it deals with where a boat can go rather than whether it's fit to leave port at all.
Here's a simple way to keep the layers straight:
| Requirement | Issued by | Covers | Frequency |
|---|---|---|---|
| BKI classification / NCVS compliance | Biro Klasifikasi Indonesia | Vessel construction and safety standards | Ongoing, periodic renewal |
| KKPRL permit | Marine spatial authority | Where the vessel can operate in park waters | Standing permit |
| SiORA registration | Komodo National Park | Passenger manifest and visitor quota | Per trip |
| Sailing Approval Letter (SPB) | Harbor Master, Labuan Bajo | Fitness to depart on a specific voyage | Per departure |
Building on that layering, the harder question most travellers actually care about is what happens if any one of these pieces is missing.
What Happens if a Boat Doesn't Have an SPB?
Without a Sailing Approval Letter, a vessel is not legally permitted to leave Labuan Bajo harbor for Komodo National Park, full stop. This isn't a formality that gets waved through when a boat is running late or a departure is urgent. The Harbor Master's office checks each vessel's documents against that day's crew and passenger list, and a mismatch, an expired certificate, or an outstanding compliance issue means the boat stays at the dock.
This matters practically for a traveller, not just administratively. A well-run operator builds SPB processing into the departure timeline, which is one reason boats typically load and prepare a little before the advertised sailing time. It also means the paperwork trail behind a trip is genuinely checked by an independent government office on the day, not just claimed by the operator's marketing.
Verdict: the SPB is the one piece of this system a traveller can't see, but it's also the one that most directly answers "is this boat actually cleared to sail today."
How Does Passenger Registration (SiORA) Connect to the Departure Process?
Stepping back from vessel-level paperwork, there's a second system that runs in parallel: passenger registration. Vessels must register their passenger manifests through the official SiORA booking system, and as of April 2026, Indonesia enforces a strict daily quota of 1,000 visitors across Komodo National Park rather than a cap on vessel numbers. All visitors must be pre-registered through SiORA, and walk-in tickets are no longer accepted once that daily cap is reached.
This is why boat operators need firm passenger counts and traveller details well before a departure date, and why last-minute additions to a booking aren't always possible even when there's physical space on board. The SPB and SiORA registration are separate systems checking separate things (the vessel's fitness to sail versus the park's visitor cap) but a departure needs both to line up cleanly.
A related requirement inside the park itself: all visitors entering dragon territory on Komodo or Rinca islands must be accompanied by a licensed park ranger. That's not paperwork a traveller needs to arrange, but it's part of the same regulatory framework that keeps both vessel and visitor activity inside the park properly tracked.
What Should a Traveller Actually Check Before Booking a Komodo Trip?
Given everything above, a traveller can't personally inspect a Harbor Master's office or pull BKI classification records. What's realistic instead is checking that the operator behind a boat is set up to meet these requirements as a matter of course, not as an exception.
A few practical markers:
- Ask whether the boat holds current insurance and certification. A well-run operator will confirm this without hesitation, since it's a standing requirement rather than a one-off favor.
- Expect documentation to be requestable, not instantly on-hand. Certificates sit with the operator or vessel owner, and can be requested on a guest's behalf, but no legitimate operator produces a full document set on demand within minutes.
- Notice how firm the operator is about passenger details and timing. An operator asking for full names and passport details well ahead of departure is usually one that takes SiORA registration seriously, not one being unnecessarily bureaucratic.
This is where a platform like Hello Flores fits into the picture rather than being a side note to it. Every boat booked through Hello Flores comes from a partner operator contractually required to hold valid insurance and current certification, and documentation for a specific vessel can be requested from the operator on a guest's behalf. That doesn't replace the Harbor Master's own check on departure day, but it means the traveller isn't the one chasing down an unfamiliar operator to ask basic questions about paperwork.
Frequently Asked Questions
Is the Sailing Approval Letter the same as a boat's registration?
No. Registration and classification are standing documents tied to the vessel itself. The SPB is issued fresh for each individual departure.
Can a boat sail without an SPB if the weather is good and the trip is short?
No. The SPB requirement applies regardless of trip length or conditions; it's tied to the Harbor Master's per-voyage clearance process, not to trip duration.
Do travellers need to apply for anything themselves?
Travellers don't apply for the SPB directly, but they do need to provide accurate passenger details in advance so the boat can complete SiORA registration ahead of the trip.
Does the SPB cover diving and trekking activities inside the park?
No. The SPB covers the vessel's fitness to sail. Park-level activities, including ranger-accompanied dragon treks, sit under separate park regulations.
Who actually checks these documents, and when?
The Harbor Master's office in Labuan Bajo checks them on the day of departure, immediately before the vessel is cleared to leave port.
Can Hello Flores provide a boat's SPB or certificates directly?
Hello Flores can request documentation for a specific boat from the operator on a guest's behalf. The SPB itself is issued by the Harbor Master per voyage and isn't something any booking platform holds on file.
Ready to Book a Komodo Trip?
Every boat booked through Hello Flores is drawn from an operator contractually required to hold valid insurance and current certification. Hello Flores can request specific documentation on a guest's behalf when asked, so the vetting is built into the process rather than left for the traveller to verify alone. Visit Hello Flores to compare boats and book a Komodo trip with the groundwork already done.
