Passage Planner v1.5 by William Wijaya

Leg by leg

Leg	From → To	Distance	In ECA	Speed	Sea time	Arrive	Port days	Depart	Sea fuel (m³)	Port fuel (m³)	ROB arr → dep (m³)

Indicative climatology (long-term averages), not a forecast.
Typhoons can occur outside these months — the NW Pacific in any month.
The equatorial belt is not marked: about 5°N to 8°S. The southern edge is set at about 10°S off Java, Bali and Lombok (direct landfalls there are very rare) and about 9°S around Sumba, the Sawu Sea and Timor (e.g. TC Seroja 2021, TC Cempaka 2017 formed just south of Java).
Always follow live warnings (JTWC, JMA, PAGASA, BMKG, IMD, BoM).

Planning estimate only — not for navigation. Use official charts and publications for the final passage plan.

Minimum distance off land is not a guarantee of depth. Shallow banks extend well offshore in the Arafura Sea, the Gulf of Carpentaria and the Java Sea — check soundings on the chart.
Shoals, and reefs too small for the 1:10m dataset, are not mapped — add them as no-go areas.
Optional seabed-depth shading uses GEBCO data delivered as AWS Terrain Tiles on a grid of about 450 m. It is indicative only, unreliable in shallows, near coasts and around banks, and is not a sounding — never use it for keel clearance.

Distances in nautical miles along a computed shortest safe-water track (0.1° ocean grid from Natural Earth coastlines, smoothed to great-circle legs).
Measured as true geodesics on the WGS84 ellipsoid; 1 NM = 1852 m.
Expect ±2–4% against published tables such as Netpas or BP Shipping Marine Distance Tables; use them for final voyage orders.
Distance shown = shortest track + your distance allowance (%), which covers coastal clearance, traffic separation schemes and berth-to-berth approaches that the shortest track ignores. The shortest figure is shown underneath each leg.

Between 92°E–148°E and 11.5°S–21°N: Natural Earth 1:10m, plus small islands that dataset lacks, taken from terrain data (AWS Terrain Tiles: SRTM, GEBCO and others) — only islets of about 0.3 km² or more, and not coastline pieces or mangrove edges. Other areas use a coarser world map.
Islands up to about 15 NM across block their grid square. Routes keep your minimum distance off land where the passage allows.
Routes inside this region are planned on a 1 NM grid and checked so they don't cut across the detailed coastline. Passages narrower than about 1–2 NM, and river ports, remain approximate.

Reefs from Natural Earth 1:10m are treated as coastline about 1 NM wide inside the detailed region (92°E–148°E, 11.5°S–21°N). That dataset is generalised, so smaller reefs and all shoals are missing.
The Great Barrier Reef is drawn as separate reef lines rather than a closed barrier — routes along Queensland must be checked against charts.
Torres Strait transits toward PNG and the Coral Sea follow the Prince of Wales Channel (planning waypoints) and the IMO two-way route in the Great North East Channel (MEPC.133(53)) to Bligh Entrance. Compulsory pilotage applies.

Cyclone zones and seasons are indicative climatology only (e.g. NW Pacific typhoons May–Dec, peak Jul–Oct). Always follow live warnings (JTWC, JMA, PAGASA, BMKG, IMD, BoM) and weather routing.
Live storms come from the GDACS feed (EU Joint Research Centre / UN OCHA), which republishes JTWC, NOAA and JMA advisories, refreshed every 30 minutes. The cone is the forecast uncertainty and the shaded areas are the forecast 60/90/120 km/h wind radii. It is not a substitute for official warnings.
Along-route weather is from Open-Meteo (ECMWF/GFS wind; Météo-France/Copernicus waves and ocean currents) for the vessel's ETA at each point, and is only available within the forecast horizon.

ECA boundaries (North Sea & Baltic, Mediterranean, North American, US Caribbean) are approximations of the MARPOL Annex VI limits.
War-risk areas follow the Joint War Committee Listed Areas JWLA-034 (29 Jul 2026, effective 8 Aug 2026), simplified to polygons — the JWC text and your war-risk underwriters govern, and listings change at short notice.
Piracy hotspots reflect IMB PRC Q1 2026 reporting and the ReCAAP Sulu–Celebes advisory.
Shelter distances are straight-line to the nearest listed port or My port — save your approved shelter areas to My ports so they are included.

ROB on arrival = ROB on departure − sea fuel.
ROB on departure = ROB on arrival − port fuel + bunkers, capped at tank capacity.
Fuel (m³) = sea days (incl. weather margin) × sea consumption + port/site days × port consumption.
"In ECA" is the sea fuel pro-rated by ECA distance.