Shape the passage.

Tap the map or choose a sailing place. Waypoints are joined by rhumb-line legs; the planner does not check land, depth or hazards.

Passage name Assumed speed kn Passage start time Entered in this device’s local time zone.

Time of day —

Saved on this device only.

Marine places

Search the starter catalogue

Catalogue data © OpenStreetMap contributors, ODbL. Coverage and details may be incomplete.

Chart context & conditions

EMODnet depth shading2024 modelled DTM, about 115 m cells. Not soundings and not for navigation.

Depth colours Shallow depth contours2, 5, 10, 20 and 30 m lines traced dynamically from the EMODnet depth-shading colours. GEBCO provides a coarser worldwide fallback.

Depth-shading contours load for the visible area at zoom level 8 or closer.

European offshore contoursEMODnet's generalised 50 m and deeper model lines. Mostly outside this starter area.

GEBCO world-ocean overviewGlobal 15 arc-second relief shown only below zoom 9. It is deliberately hidden at local sailing zooms where it becomes blocky. NOAA official ENC imageryCurrent chart display service, updated weekly and visible only in US chart coverage. OpenSeaMap seamarksCrowd-sourced aids and marine features; not an official chart. Sailing placesSource-attributed catalogue filtered above.

Time-aware wind fieldShow map-wide arrows and speeds. Near the route, samples use the expected passage time.

Wind field hidden. Turn it on to load model wind.

<10 kn 10–17 kn 18–27 kn 28+ kn Purple halo: expected route time

Model current fieldShow a zoom-adaptive ocean-current field. Arrows near the passage use its expected time; arrows farther away use current time.

Current field will load for the selected passage start.

Tide-adjusted contour labels will appear where the chart and water-level datums can be reconciled.

Current time Blended time Expected route time Course to steer Desired ground track Arrows point with the flow

Regional depth shading and contours: EMODnet Bathymetry DTM 2024, EU, CC BY 4.0. Worldwide fallback and global overview: GEBCO 2026 Grid. Shallow contours are derived on demand for the visible map, with detail increasing as you zoom in; GEBCO is substantially coarser, and neither source describes dredged marina basins or safe under-keel clearance. US chart imagery: NOAA Chart Display Service. Wind, sea level and ocean-current guidance: Open-Meteo model forecasts, CC BY 4.0. Current and sea-level fields are about 8 km resolution and explicitly unsuitable for coastal navigation. Solent LAT/MSL datum transforms: TICON-4 via Neaps, CC BY 4.0. None of these model values is observed pilotage data.

External access
LINZ New Zealand — free official S-63 ENCs require registration and a compatible chart system; CC BY chart-image services require a free LDS key.
Open LINZ ENC service
Licence blocked
UKHO free marine datasets — not loaded because their current terms prohibit use in creating navigational products.
Review UKHO source

Passage points

Waypoints

Add the first waypoint

Tap the map or add a marine place.

Distance—

Current-adjusted time—

Expected arrival—

Legs0

Leg	Course	Distance	Model current	ETA

The coral dashed line is the desired ground track. Amber arrows show the modelled course to steer to stay on it. Current samples are taken about every 2.5 NM. These are planning estimates, not helm instructions.

Import GPX

Tap water to add a waypoint Drag waypoint markers to refine the passage.

Tide & daylightPassage time

Model tide near departure Loading…

Sun at destination Loading…

Model guidance only. Tide heights are not official predictions; check a nautical almanac and local sources.

Modelled depth shading and contours + general basemap + crowd-sourced seamarks Not a nautical chart