Best Boating Apps for Navigation and Weather

Boating apps have transformed navigation, weather forecasting, and passage planning. A modern smartphone or tablet can serve as a backup chart plotter, a detailed weather station, and a tide predictor — all in a device that fits in a pocket. This guide covers the best boating apps for navigation, weather, tides, and marina booking, with notes on what each does well and where its limitations lie.

Navigation apps

Navionics

Navionics is the most widely used boating navigation app, offering detailed electronic charts for most of the world's waters. Features include route planning, depth contours, sonar charts (community depth data), and automatic routing that calculates a route avoiding shallow water. Navionics integrates with many chart plotters (Raymarine, Simrad, B&G) for chart syncing. The app requires an annual subscription (around €50-100 per region). Its main limitation is that community-sourced sonar data can be unreliable in less-travelled areas.

iNavX

iNavX is a popular alternative for iOS users, supporting charts from multiple providers including Navionics, C-MAP, and NOAA. It offers route planning, instrument integration, and AIS display. iNavX is particularly valued for its flexibility — you can use charts from different sources rather than being locked into one provider. The app itself is free, but chart subscriptions are purchased separately.

OpenCPN

OpenCPN is a free, open-source chart plotter that runs on Windows, Mac, Linux, and Android. It supports a wide range of chart formats including free NOAA charts (US waters) and ENC charts. OpenCPN is popular with long-distance cruisers who want a no-cost solution and are comfortable with a more technical interface. It lacks the polish of commercial apps but offers powerful features including AIS, weather routing, and plugin support.

SeaNav

SeaNav is a simpler navigation app suited to day boaters and casual cruisers. It offers basic chart display, route planning, and AIS. Its strength is ease of use — it is a good choice for boaters who want straightforward navigation without the complexity of Navionics or OpenCPN.

Weather apps

Windy

Windy (Windy.com) is the most popular weather app among sailors, offering visual wind, wave, and precipitation forecasts from multiple weather models (GFS, ECMWF, ICON). The animated wind map makes it easy to see patterns and plan passages. Windy is free with optional paid features. Its main limitation is that the forecast resolution is coarser than dedicated marine weather services — fine for general planning but less precise for local conditions.

PredictWind

PredictWind is a dedicated marine weather service that offers high-resolution wind forecasts, weather routing, and passage planning. It uses proprietary weather models that claim higher accuracy than public models, particularly in coastal areas. PredictWind offers a free tier with basic forecasts and paid tiers with detailed routing and offshore forecasts. It is the preferred choice for offshore sailors planning multi-day passages.

WeatherTrack / Weather4D

These apps download GRIB files — raw weather model data — and display them as overlays on charts. GRIB files are compact and can be downloaded via satellite or SSB, making these apps popular with offshore sailors who need weather data without internet. The learning curve is steeper than Windy or PredictWind, but the data is the same used by professional forecasters.

Tide and current apps

Tides Planner

Tides Planner provides tide heights and times for thousands of stations worldwide. It is essential for planning harbour entries, bridge clearances, and tidal currents. The free version covers a limited number of stations; a subscription unlocks global coverage.

AyeTides

AyeTides is a well-established tide app for iOS, offering tide predictions for over 10,000 stations. It displays tide curves, sunrise/sunset times, and current predictions. A one-time purchase rather than a subscription, making it popular with long-term users.

Marina and anchorage apps

Navily

Navily is a community-driven app for finding and reviewing anchorages and marinas. Users contribute anchorage information including holding, depth, protection, and photos. It is particularly useful in the Mediterranean where official anchorage information is sparse. Navily is free and covers most popular cruising areas.

MarinaRes / Dockwa

These apps allow you to book marina berths in advance, similar to booking a hotel room. MarinaRes covers European marinas; Dockwa covers the US. Booking ahead is increasingly necessary in popular Mediterranean marinas during peak season. For more on marina procedures, see our marina etiquette guide.

Safety and communication apps

BoatUS / RYA SafeTrx

These apps track your passage and send your float plan to a designated contact. If you do not arrive as planned, the contact can alert the coast guard with your last known position. SafeTrx is used by the Irish and UK coast guards; BoatUS offers similar functionality in the US. These apps are free and provide an additional safety layer alongside VHF and EPIRB. For more on safety procedures, see our night boating safety guide and safety equipment guide.

Apps as backup, not replacement

Boating apps are powerful tools but should never be the sole means of navigation. Battery failure, water damage, and signal loss can render a phone useless. Always carry paper charts as backup, maintain a dedicated chart plotter with its own power supply, and know how to navigate without electronics. The best approach is redundancy: chart plotter as primary, tablet with Navionics as secondary, paper charts as tertiary, and a handheld VHF for communication. For more on essential equipment, see our boat buying checklist.