Real-time wind and ocean current vectors, boat polars, and automatic tack optimization. No install required. Plan like a pro in seconds.
No credit card required. No app to download. Just open sailplotter.com on your tablet at the helm and go.
Three layers of intelligence that turn a line on a chart into a real sailing plan.
Sail Plotter pulls real-time, global data from Open-Meteo the moment you start planning. We combine wind speed and direction with ocean current speed and direction as vectors to solve the Current Triangle. The result: the exact compass heading you need to steer so that wind propulsion plus current drift lands you where you actually want to go.
A catamaran doesn't sail like a monohull. Sail Plotter uses high-precision Polar Performance Tables with bilinear interpolation. Enter your hull type or waterline length, and the engine calculates your actual speed-over-ground at every wind angle. No more "average speed" guessing.
This is where Sail Plotter shines. If your destination is upwind, the Automatic Tack Engine uses geometric ray-casting to identify exact tack and jibe points, compare port vs. starboard-first strategies, apply a tacking penalty based on your crew's skill, calculate your VMG (Velocity Made Good) on each leg, and give you a realistic ETA that accounts for every extra mile sailed.
Every feature designed to close the gap between the chart and the cockpit.
Live wind speed, wind direction, ocean current speed, and ocean current direction — pulled globally in one click. Both are used as vector inputs to every route calculation.
Port-first vs. starboard-first comparison with layline geometry. The engine evaluates multiple strategies and picks the fastest route through the no-go zone.
Particle-animated wind overlay across your entire route. Visually assess wind patterns at a glance — not just at a single point.
Bilinear-interpolated speed tables for Catamaran and Monohull. Your boat speed is calculated at every wind angle, not assumed as a flat average.
Wind propels your boat. Current pushes it sideways. The current triangle solver combines both vectors to compute your true Course Over Ground (COG) and Speed Over Ground (SOG) — then tells you the compass heading to steer.
See your actual speed toward the destination on every leg — not just speed through water. VMG/TBS efficiency percentages show exactly how much of your boat speed is working for you vs. lost to tacking angles.
Every leg shows True Wind Angle, Apparent Wind Speed, and Apparent Wind Angle — the numbers you actually see on your instruments. Cross-reference your plan with what you'll read at the helm.
Leg-by-leg timing with tacking penalties and point-of-sail analysis. Know exactly how long each segment takes and why.
Name your route, choose where to save it, and load it back anytime. Routes preserve all waypoints, settings, and calculation results as portable JSON files. Share routes with crew or archive your passage plans.
Instantly toggle wind or current off with one click and recalculate. See exactly how many minutes and miles each environmental factor is costing your passage. Toggle back to restore — your settings are never changed.
Comprehensive in-app help covers getting started, wind & current theory, tacking strategy, map legend, and a full glossary of every column in the results table. New to sailing navigation? We've got you.
Most web plotters draw lines. Sail Plotter plans passages.
| Feature | Standard Plotters | Sail Plotter |
|---|---|---|
| Point-to-point routing | ✓ | ✓ |
| Live weather integration | ~ | ✓ |
| Automatic tack points | ✗ | ✓ |
| Current triangle solver | ✗ | ✓ |
| Polar performance tables | ✗ | ✓ |
| Bilinear speed interpolation | ✗ | ✓ |
| Animated wind visualization | ✗ | ✓ |
| VMG efficiency per leg | ✗ | ✓ |
| True & apparent wind per leg | ✗ | ✓ |
| Realistic ETA with tack penalties | ✗ | ✓ |
| Named route save & load | ✗ | ✓ |
| “What-if” wind/current toggle | ✗ | ✓ |
| Works in browser, no install | ~ | ✓ |
Plan your next voyage with confidence.
Recreational sailors care about reliability. Here's what's under the hood.
Powered by Open-Meteo's marine forecast APIs. Global coverage, updated hourly. No separate weather subscription needed.
Calculations run server-side. Your route data stays private. No tracking, no ads, no data sold to third parties.
Payments handled by Stripe — the same processor used by Amazon and Google. We never see or store your card number.
Start with a free 3-day trial. No credit card required.
No app store. No downloads. Just open sailplotter.com on your tablet at the helm and go.
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