To calculate fuel burn for the Sorong–Misool run, multiply the distance — roughly 90–110 nautical miles to the southern resorts and homestay areas depending on destination and routing — by your boat’s measured litres per nautical mile at operating load, add 20–30 percent weather margin for the exposed open-water legs, then add a 30 percent reserve on the total. For a loaded 12 m tender burning 2.5 litres per mile, that arithmetic gives roughly 250–280 litres one way and a mission total near 650–700 litres for a round trip without guaranteed refuelling at the far end. The run is not technical; it is simply long, and fuel discipline is the whole game.
Know your real litres-per-mile first
Every serious calculation starts with a measured burn figure, not a brochure number. Load the boat to working displacement — crew, gear, water, the fuel itself — and run a two-way measured distance at your standard cruise, logging fuel flow or tank drop. Repeat at one lower speed, because the Misool run frequently rewards slowing down: many planing hulls burn 15–25 percent less per mile a few knots below their habitual cruise. Weight is the underlying variable, as explained in the hull weight versus fuel burn article — a boat that has quietly gained 300 kg since last season has quietly changed its own numbers.
Route legs and where the margin goes
The passage south crosses open water with meaningful fetch; wind against you for four hours does to your fuel plan what it does to your spine. Budget the weather margin leg by leg rather than as a single lump: the exposed middle section deserves the most. Currents around the island groups can help or hurt by a knot or more — local knowledge about timing departures is worth real litres. And plan the day so the long legs run in the morning calm; the afternoon deterioration pattern familiar from the Sorong–Waisai planning article applies doubly on a five-hour passage.
Fuel at the far end: assume nothing
Southern Raja Ampat has no guaranteed commercial bunkering for visiting small craft. Resorts and homestays manage their own drum logistics, and arrangements for visiting boats must be made in advance — in writing, with quantities and dates. The professional standard for a first run south is carrying the full round trip plus reserve, treating any fuel obtained there as bonus. This is precisely why long-range tankage and drum stowage are specification items: the operating pattern is described on our logistics and range page, and the tank and deck arrangements to support it are fixed during the commissioning process.
A worked example, end to end
Take a 12 m support tender, measured at 2.4 litres per nautical mile at 19 knots loaded. Route Sorong to a mid-Misool destination: 100 nautical miles. Base burn 240 litres; weather margin at 25 percent adds 60; leg total 300 litres. Round trip 600; reserve at 30 percent brings the mission fuel to 780 litres. If built-in tanks hold 600, the specification answer is either 200 litres of secured drum stowage or a slower cruise: dropping to 16 knots at 2.0 litres per mile brings the mission under 660 litres. Doing this arithmetic before the boat exists is what tankage specification means.
Weather windows and the go/no-go decision
The Misool run rewards patience arithmetic. A forecast day of fresh headwinds can add thirty percent to the burn and two hours to the passage — often the honest response is to hold twenty-four hours rather than spend the reserve. Build the decision structure in advance: a written go/no-go checklist covering forecast wind against route legs, measured tank state against the mission requirement, load aboard versus the burn figure used, and daylight remaining at the destination end. Crews follow checklists they helped write; the alternative is departure decisions made by schedule pressure, which is how reserves get spent quietly and stories get written loudly.
Recording every run: the operator’s own dataset
After a season of logged passages — date, load, speed, conditions, litres consumed — an operator owns something better than any calculation: a private dataset for their exact hull on their exact routes. Patterns emerge quickly: the real cost of the afternoon departure, the efficiency knee of the hull, the drift in burn that flags a fouling bottom or a tired propeller weeks before anything feels wrong. A laminated log sheet at the helm and ten minutes of discipline per passage builds it. We hand new owners the log template at delivery precisely so the dataset starts on day one, when the hull is clean and the baseline is true. Six months later that baseline is the reference every anomaly is judged against.
Frequently Asked Questions
How long does Sorong to Misool take by speedboat?
At 18–20 knots loaded, roughly five to six hours to the southern resort areas in fair conditions, excluding stops. Slower economical cruising stretches it toward seven; weather can add more. It is a committed day passage, not a hop.
Can I refuel at Misool resorts or homestays?
Only by prior arrangement. Some resorts will sell drummed fuel to visiting boats they know, at premium prices reflecting their own logistics; homestays generally cannot. Confirm quantity, date, and price in advance, and still carry your reserve untouched.
What speed is most fuel-efficient for the run south?
For most planing tenders, the sweet spot sits just above minimum planing speed — commonly 15–17 knots — where the hull runs clean at modest throttle. Below planing the boat is efficient but the passage stretches beyond a working day; measure your own hull’s curve and pick the knee of it.
Raja Ampat Boat Builder Desk — a specialist maritime brand under Juara Holding Group. Construction contracts issued by PT Komodo Galangan Nusantara. WhatsApp +62 811-3823-875 · sales@komodoluxury.com