NOAA slack-tide windows, live current vectors at the site, an anchor alarm that keeps watch while divers are down, and the weather before it reads you. The map behind this text is live.
The dive belongs to the tide. ChartNav draws today's real curve, the current field around the site, and the charted bottom — on one screen.
NOAA CO-OPS predictions drawn as they stand right now; the amber line is this moment. In the app the nearest station auto-locks to your GPS, so the slack you brief is the slack at your site.
RTOFS 1/12° surface currents as a live vector field — set and drift for the descent line, the drift plan, and the pickup.
Real NOAA ENC — wrecks with least depths, rocks, obstructions, depth tints you can re-threshold to your gas plan. Soundings in feet, meters, or fathoms.
While the group is on the wreck, the boat keeps its own watch — on the hook, on the crew ashore, and on the cell building to the southwest.
Set a drift radius and the alarm watches the GPS trace against it. This is the actual logic, running in this card — watch the boat swing at anchor, then drag, then get caught.
Live NDBC observations from the buoy nearest the site — wind, gust, waves, water temperature. These numbers are the buoy's latest report, not a forecast.
Live position sharing between boats and shore crew, with a freshness gate: when a feed goes quiet, it says CONTACT LOST — it never quietly shows a stale dot. Watch the demo run the failure.
Blitzortung strikes on a 60-minute rolling window with radius alerts — the surface interval decision, made early.
Real WSR-88D scans, looping the last eight sweeps. When the afternoon build-up starts inland, you see it over the same chart your sites are marked on — with NWS warning polygons when they're issued.
Drift radius over your GPS trace. If the hook drags with divers down, it yells.
Long-press the chart: MOB, anchor, or mark — position fixed at the press.
Waypoints at wrecks, reefs, and holes with notes — GPX 1.1 export to the plotter.
Live wind, gust, and wave from the buoy nearest the site — the sea state before you steam.
NWS dense-fog advisories and the GOES fog layer — before the bank rolls in.
Live AIS of everything near the anchorage — see who's bearing down on the flag.
Web in any browser · iPhone & iPad native app · Apple TV boat-dashboard mode · Apple Watch on your wrist. Sites, routes, and alarms stay in sync.
NOAA CO-OPS current predictions at the station nearest your site, drawn as a live curve with the weak-water windows readable at a glance. The station auto-locks to your GPS.
Yes — in the browser or the installed PWA it keeps watching your GPS trace against the drift radius. Pair the phone's audio out with a horn if you want it loud.
Yes. Drop waypoints with notes. Libraries live on your device in browser storage and never leave unless you export as GPX.
NOAA NEXRAD Level-2 and NIDS, NWS alerts and dense-fog advisories, NDBC buoy wind and wave, GOES satellite, and live lightning feed.
Yes. Every AIS-equipped vessel within range renders on the chart with live position, speed, and heading — useful for managing the dive flag radius and pickup zone.
Browser-based. No App Store. Your phone or helm tablet, a chart, and the whole dive-day briefing.
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