Is Sea Maps a free nautical chart app for iPhone?

Yes — Sea Maps is free to download and use. It includes detailed nautical charts, AR waypoint navigation, marine weather and GPX route planning. An optional Pro subscription removes ads.

Do the nautical charts work offline on iPhone?

Yes. Sea Maps caches up to 2 GB of map tiles persistently on your device. Tiles you view once stay available offline, and a route prefetcher can download every tile along a planned passage before you leave port.

Can I plan routes and import GPX files?

Yes. You can create routes by tapping waypoints on the chart, save them with custom names, follow them with turn-by-turn guidance, and import or export GPX files to share tracks with crew.

Marine · NauticalSea Maps & AR: Boat GPS

Free Nautical Chart App for iPhone — your whole passage on one chart.

Name: Sea Maps & AR: Boat GPS
Rating: 4.6 (120 reviews)
Author: Avo Agency

// free nautical chart app · offline sea maps · AR navigation · iPhone & Apple Watch

A free nautical chart app for iPhone that brings detailed offline sea maps, AR waypoint guidance and marine weather to sailors, boaters and fishermen. Depth contours, harbours, anchorages and lighthouses on a high-detail marine chart — with an AR navigator, GPX route planning and up to 2 GB of offline tiles cached on your device.

Download on theApp Store ← All apps

AR waypoint beacon 2 GB offline tiles GPX import / export Marine weather Apple Watch

Screens

From chart to camera.

Real screenshots from the App Store. Tap any screen to see it full size.

Sea Maps nautical chart with depth contours and POIs

Sea Maps AR navigator beacon on the live camera

Capabilities

Nautical chart features — everything on one chart.

Six instruments working together — and every one keeps running when the signal runs out.

High-detail sea chart

Depth contours, harbour entrances, anchorages, lighthouses, buoys, marinas, fuel docks, beaches and dive sites surface on the chart. Tap any POI for photos, a description and one-tap directions.

Offline tile cache

Store up to 2 GB of map tiles persistently — anything you view once stays available offline. A route prefetcher downloads every tile along a planned passage before you leave the dock.

AR navigator

Overlays your destination as a luminous 3D beacon on the live camera, with a pulsing cone for the bearing and a live distance label — perfect for unmarked anchorages, mooring buoys and hazy, featureless horizons.

Route planning

Tap waypoints to build routes, save them with custom names and follow turn-by-turn guidance. Import and export GPX, and run navigation in the background with low battery impact and audible + push arrival alerts.

Weather & sea-state

Wind direction and speed, wave height, sea state and a short-term forecast are woven straight into the map — everything you need for a confident go / no-go decision before casting off.

Apple Watch companion

Bearing, distance to your next waypoint and current speed at a glance on the wrist — sun-readable contrast and minimal battery impact, so the helm always has the numbers that matter.

Specs & privacy

Nautical GPS app specs & privacy.

Open sources, no account, no hidden tracking. The chart and your position stay where they belong.

CategoryNavigation · Marine

PlatformsiPhone · iPad · Apple Watch

LanguagesEN · IT · ES

PriceFree · Pro removes ads

Map dataOpenStreetMap · Open-Meteo

Latest version2.3

Privacy first

No account, no hidden tracking and no follow-you-around ads — your location stays on the iPhone. Charts come from OpenStreetMap and weather from Open-Meteo, both keyless and signup-free. The app includes Google AdMob (removable with Pro) and shows Apple's standard ATT prompt, so you stay in control.

More instruments

The rest of the collection.

One philosophy across sea, trail, summit and the off-grid airwaves.

Anchor AlarmMarine · Safety Peak AltimeterMountain · Outdoor OpenMapsTrail · Topographic TalkyComms · Off-grid

Questions

Free nautical chart app — FAQ

Is it free?Yes — free to download. Pro removes ads.

Offline charts?Up to 2 GB of tiles cached on-device.

GPX support?Import and export routes as GPX files.

Apple Watch?Bearing, distance & speed on the wrist.

Map data?OpenStreetMap · depth contours, buoys, anchorages.

Cast off

Set your course.

Free to start, no account, no signal required. Put the whole chart in your pocket before the next passage.

Download on theApp Store All apps