NEXRAD Level-2 radar, satellite cloud, lightning, wind barbs, currents, fog — rendered over NOAA ENCs in one unified chart. The briefing you'd get on shore, live at the helm.
Read the sky ← other watersFull-resolution Level-2 reflectivity decoded in the browser, tinted in the NWS-RIDGE palette you already know. Not the mushy tile layer your weather app gives you — the raw feed the meteorologists use.
Worker-threaded decode means no frame drops. Sweep animation gives you storm-cell motion vectors by eye. Scroll-wheel zoom all the way into individual gates.
Stack the layers you need, strip the ones you don't. Wind barbs from model grids, lightning strikes from GLD360, currents from GoMOFS and CO-OPS stations, fog advisories from NWS, alerts painted live.
Every overlay is independently toggle-able. The chart never becomes a soup — because you decide what's on it.
Drop a route, overlay the forecast radar and the current field, run the tide clock. See departure windows that don't need a screenshot collage from four different sites.
Plans export as GPX for your chartplotter. Current set and drift are computed at each leg. Weather windows update as NEXRAD updates.
Reflectivity, velocity, echo-top, base reflectivity — in the NWS palette you already trust.
Live cloud-to-ground strikes via GLD360-style feed. Time-fading. Scroll context.
Model wind at altitude of care — gridded barbs in 5-knot increments.
Arrows with set and drift, slack indicators, auto-nearest station, GoMOFS where available.
NWS dense-fog zones as translucent polygons. At a glance, where to slow down.
Passage plans cross-reference forecast cells so your ETA accounts for what's coming.
Curve, moon phase, current direction at slack/flood/ebb. The almanac, on the chart.
GOES IR loops beneath your radar — the big picture above the local picture.
What offshore sailors ask before committing to a passage tool.
For marine use, yes. ChartNav integrates NEXRAD Level-2 radar, wind barbs, currents, lightning, fog, and NOAA alerts over NOAA nautical charts. Windy is general-purpose; PredictWind paywalls offshore routing. ChartNav is free and marine-first.
NOAA NEXRAD L2 + NIDS radar, NWS watches/warnings/fog advisories, NDBC buoy wind and wave, NOAA CO-OPS tides and currents, GOES satellite, and a live lightning feed.
Yes. Drop waypoints and ChartNav overlays forecast weather, current vectors, and tide stage per leg. Plans export as GPX 1.1. Current set and drift compute per leg for realistic ETAs.
Yes. Installs as a Progressive Web App on iOS and Android — 'Add to Home Screen' from a browser. Large-type rolling road display is available for helm use.
Wind barbs and gridded fields are sourced from NWS model output today. Native GRIB file import is on the roadmap. NEXRAD, fog, and alerts are live now.
L2 products update every 4–10 minutes per site's VCP. ChartNav renders the latest scan with no lag beyond NOAA's publish cadence.
Launch it on the boat tonight. Works on phones, tablets, and chartplotter tablets.
Open ChartNav