SeaChart: Offline Marine Nav

SeaChart brings marine charts, trip planning, weather insights and practical boating tools together in one easy-to-use app. Whether you are cruising, sailing, fishing or exploring the coast, SeaChart helps you prepare before departure and stay informed on the water.

MARINE CHARTS THAT WORK OFFLINE
Download chart regions for use when mobile coverage is weak or unavailable. Explore nautical details, depth information, navigation aids and useful map layers without depending on a constant internet connection.

PLAN AND FOLLOW YOUR TRIP
• Create, edit and save routes and waypoints
• Navigate to a selected destination
• View remaining distance, bearing and estimated arrival time
• Record tracks and review previous trips
• Measure distance and bearing on the map
• Import and export supported route and track data

WEATHER, TIDES, SUN AND MOON
View global forecast layers for wind, waves and atmospheric pressure. Download forecasts for later offline use. Check tide predictions, sunrise and sunset times, moon phase, and the estimated position of the sun and moon.

SAFETY AND BOATING TOOLS
Anchor Watch monitors movement beyond your chosen radius. Man Overboard (MOB) quickly saves an emergency position. GPS status, saved locations, boating conditions and fishing activity indicators provide more useful information for your trip.

SMART PLANNING AND SHARING
Compare offshore boating conditions using wind, gusts, waves, swell, precipitation, pressure and temperature. Review shore-fishing activity windows informed by tide, sun, moon and depth data. Search chart features, inspect light sectors and customize chart layers. Share routes and saved positions with GPX, KML or offline QR codes.

AIS RISK AND MARINE INSTRUMENTS
When a compatible AIS receiver is connected, view vessel details, predicted movement and CPA/TCPA collision-risk alerts. During active navigation, SeaChart can send configurable NMEA 0183 guidance to compatible instruments or autopilots.

AIS AND NMEA
Connect to a compatible AIS receiver or marine gateway over TCP or UDP to display nearby vessel information when available. SeaChart can also provide NMEA 0183 navigation output to compatible marine instruments and autopilots.

IMPORTANT SAFETY NOTICE
SeaChart is a planning and situational-awareness aid only. It is not an official nautical chart, certified chartplotter or substitute for proper seamanship. Chart, depth, weather, tide, AIS and route information may be incomplete, inaccurate or out of date. Never rely on this app as your only source of navigation or safety information. Always use official charts and notices, maintain a proper lookout, verify local conditions and follow applicable maritime regulations. You remain solely responsible for the safe operation of your vessel.