Required Time of Arrival, Speed Reduction, Sailing Fuel, Anchorage Waiting, Bunker Cost, Carbon Value & Berth-Time Economics
Just-in-Time Arrival Fuel & Waiting Cost Optimizer
Compare the current plan of sailing faster and potentially waiting outside port with a constrained Just-in-Time arrival timed to berth, fairway and nautical-service availability. The optimizer separates speed-sensitive propulsion fuel from fixed sea auxiliaries and keeps anchorage fuel, non-fuel waiting exposure and optional carbon value visible.
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Need current/weather correction, contractual speed limits, waiting economics, carbon value and berth-time uncertainty? Click Advanced above.Advanced distinguishes speed through water from speed over ground and stress-tests berth readiness moving earlier or later.
Fast JIT Arrival Screen
Exactly 10 primary inputs. Simple assumes speed through water equals speed over ground and treats the entered current sea-fuel rate as propulsion plus fixed auxiliaries using the entered fixed share.
nautical miles to the JIT arrival point.
knots.
hours from now.
hours early relative to readiness.
knots. Optimizer will not go below this value.
MT/day at the current planned speed.
% not reduced by the speed-fuel curve.
Speed-sensitive fuel/day scales approximately with speed^n.
MT/day while waiting.
Selected currency/MT.
Voyage Timing & Arrival Constraints
nautical miles to pilot boarding place / chosen JIT arrival point.
knots.
knots added to speed through water to estimate speed over ground. Negative = adverse.
hours from now.
hours early.
knots.
% below current planned speed.
± hours used only for scenario sensitivity.
Detailed Fuel Model
MT/day at current planned speed.
MT/day while sailing.
MT/day while modeled waiting occurs.
Selected currency/MT.
Waiting, Carbon & Coordination Economics
Selected currency/waiting day. Avoid double-counting items already embedded elsewhere.
Selected currency per scenario if waiting > 0.
Selected currency.
tCO₂/MT fuel for the entered accounting basis.
Selected currency/tCO₂. Enter 0 to disable.
% of modeled CO₂ valued at the entered carbon price.
JIT Arrival Readiness
Voyage-planning screen only: the calculated JIT speed is not navigational or engine-operating advice. Actual safe speed and arrival planning depend on weather, currents, traffic, under-keel clearance, tides, pilotage, machinery operating limits, charterparty obligations, cargo requirements, port instructions and the reliability of berth, fairway and nautical-service availability. Recalculate whenever the requested arrival time materially changes.