Sea Info Map -Tides,Fishing

Offline tide prediction from harmonic constants: high/low tides, spring/neap, plus sea temp, currents, waves & chlorophyll — the marine picture in one map pin.

Sea Info Map brings tides, weather, ocean and astronomy together in a single map pin — built for working on and around the water.

■ Offline tide graph High-accuracy tide prediction runs entirely on your device, using official harmonic constants. Even offshore with no signal, see high/low tide times, spring/neap tides, and the continuous tide curve. Covers 239 reference ports across Japan.

■ Map overlays (heat-map layers) Overlay sea surface temperature (SST), chlorophyll-a (a fishing-ground / tide-line indicator), significant wave height and ocean currents as color layers on the map. Temperature fronts (tide lines) and strong-current bands such as the Kuroshio stand out at a glance. SST uses the latest ~5 km gap-free data and is shown from launch. Wave and current layers are forecast-aware and animate with the time slider.

■ Wind Wind arrows show where the wind is blowing (direction + speed), so you can read wind direction and strength at a glance. Forecast-aware and synced to the time slider.

■ Charts & base map Satellite / standard base maps with OpenSeaMap nautical marks (lighthouses, buoys, navigation aids, depth marks) overlaid. The day/night terminator is shown too.

■ Point data (tap to read) Temperature, wind speed/direction, pressure, precipitation chance, UV index and conditions; SST, currents, wave height, chlorophyll-a and depth. Also an estimate of how pressure (inverse barometer) and wind (set-up) may raise/lower the actual water level, plus a heat-stress (heatstroke) alert.

■ Astronomy (offline) Sunrise/sunset, moonrise/moonset and moon phase — handy for night fishing and night work.

■ Time slider Drag the date/time slider at the bottom and the tide curve, weather, ocean data and map overlays (forecast, up to ~10 days ahead) update together on the map — from the past into the future.

■ Favorites & CSV export Save your go-to spots and export tide (high/low), weather and ocean data to CSV for reports and records.

■ Made for

• Fishing (shore, boat, breakwater)
• Fisheries and aquaculture
• Marine construction, harbor work, diving operations
• Diving and marine leisure
• Operating small craft

Note: data in this app is a planning/leisure reference only and is not a substitute for official nautical charts or tide tables. Use official sources for navigation and safety.

Tide data: Japan Meteorological Agency (https://www.data.jma.go.jp/) Ocean data: NOAA CoastWatch, E.U. Copernicus Marine Service Information (DOI: 10.48670/moi-00017) Maps: Mapbox / OpenStreetMap / OpenSeaMap

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/